Previously, if one wants to create a custom `JmsListenerContainerFactory`
or `RabbitListenerContainerFactory`, a bunch of code from the auto-
configuration must be duplicated.

This commit introduces two services to configure such factory for JMS
and AMQP with the same sensible defaults that were applied by the
auto-configufrations.

Closes gh-5138

Previously, if an application had been started without remote
debugging enabled, an attempt to connect to it via
RemoteSpringApplication and the HTTP tunnel would result in the
application being hammered by connection attempts for 30 seconds.

This commit updates the tunnel server to respond with Service
Unavailable (503) when a connection attempt is made and the JVM
does not have remote debugging enabled. When the client receives a
503 response, it now logs a warning message describing the possible
problem before closing the connection.

The client has also been updated to provide improved diagnostics when
a connection to the tunnel server cannot be established, for example
because the remote URL is incorrect, or the remote application isn't
running.

Lastly, the client has been updated so that it continues to accept
connections when a connection to the server is closed. This allows
the user to correct a problem with the remote application, such as
restarting it with remote debugging enabled, without having to also
restart the process that's running RemoteSpringApplication.

Closes gh-5021

Previously, WebRequestTraceFilter would call request.getParameterMap()
before deciding whether or not the parameters should be included in
the trace. For a POST request, this had the unwanted side-effect
of always reading the request body.

This commit updates WebRequestTraceFilter so that it checks that
parameters are to be included in the trace before calling
request.getParameterMap()

Closes gh-5089

Closes gh-5122

Closes gh-5073

Closes gh-5131

Previously an in-memory database that wasn’t pooled (an
EmbeddedDatabase) would be shutdown when the context restarted, but
an in-memory database wrapped in a connection pool was not. This meant
that the former would be be wiped clean after each restart, whereas the
latter would not. In addition to being inconsistent, this also
caused problems with schema.sql and data.sql scripts when using
DevTools. If you were using an in-memory database wrapped in a
connection pool, a failure may occur during a restart as the scripts
were not being run against in clean database.

This commit adds an auto-configured bean to DevTools that, when the
context is being closed, will execute “SHUTDOWN” if it identifies that
the DataSource is not an EmbeddedDatabase and is for an in-memory
database.

Closes gh-4699

Also, the section on `server.*` configuration was poor so this commit
also improves it.

Closes gh-4989

Previously, WebSocketMessagingAutoConfiguration added a single
additional converter. This was a MappingJackson2MessageConverter
configured with the auto-configured ObjectMapper.
AbstractMessageBrokerConfiguration places additional converters before
any of the default converters. This meant that the auto-configuration
had the unwanted side-effect of changing the ordering of the
converters. A MappingJackson2MessageConverter was now first in the
list, whereas, by default, it's last in the list after a
StringMessageConverter and a ByteArrayMessageConverter.

This commit updates WebSocketMessagingAutoConfiguration so that it
switches off the registration of the default converters and registers
a StringMessageConverter, ByteArrayMessageConverter and
MappingJackson2MessageConverter in that order. A test has been
added to verify that the types of these three converters match
the types of the default converters. A second test that verifies
that String responses are converted correctly has also been added
alongside the existing test that verified the behaviour for JSON
responses.

Closes gh-5123

Closes gh-4936

When the `locations` attribute is set for a given bean annotated with
`@ConfigurationProperties`, the configuration at these specified
locations take precedence over any other property sources. This means
that such values can't be overridden by a system property or a command
line switch for instance.

This commit clarifies this rules in the documentation.

Closes gh-5111

DriverClassNameProvider is unused but was probably restored by a merge
commit at some point. It wasn't obvious and updated that class rather
than `DatabaseDriver`.

This commit updates `DatabaseDriver` and deletes
`DriverClassNameProvider`.

Closes gh-5076

Closes gh-5044

Closes gh-5108

Closes gh-5118

* gh-5059:
  Remove Docker container after launch script test execution

Closes gh-5059

Closes gh-5103

Previously, BeanDefinitionLoader declared a field of type
GroovyBeanDefinitionReader which is a GroovyObject subclass. This is
problematic as BeanDefinitionLoader is always loaded but Groovy is an
optional dependency. Even on a JVM where class verification is performed
lazily, this can still cause problems if something reflectively tries
to access the class’s declared fields. On a JVM where classes are
verified at load time, it would be impossible to start a Spring Boot
application without having Groovy on the classpath.

This commit changes the field to be a BeanDefinitionReader, removing
the indirect reference to GroovyObject form BeanDefinitionLoader’s
signature. The reader is downcast to a GroovyBeanDefinitionReader in the
body of a method body that will only be invoked when Groovy is on the
classpath.

Closes gh-5040

Update SpringBootJoranConfiguratorTests to ensure that logback
is left in a sane state. Prior to this commit, running all tests
in eclipse would fail due to ErrorPageFilterTests expecting
specific log output.

Closes gh-5025

Spring Boot fires event very early in the application lifecycle and we
should make crystal clear that a regular `@Bean` registration cannot be
used to register a listener on them.

Closes gh-5061

This commit enables the use of // @formatter:off and // @formatter:on
to surround lines of code that should not be formatted. It also adds
a code template that can be used to quickly wrap the selected lines
of text with the off and on comments.

Closes gh-5050

Closes gh-5041

* pr/5013:
  Polish

Closes gh-5013

Closes gh-4955

Since 2.2.5 hasn't yet been released we'll need to rollback for our
release.

See gh-4789

Update the ContextIdApplicationContextInitializer default NAME_PATTERN
to favor the developer defined `${spring.application.name}` value over
the deployer defined `${vcap.application.name}`.

Fixes gh-4926

Update TomcatEmbeddedServletContainerFactory so that logic to disable
persistent sessions happens after Tomcat's standard Manager creation
logic.

Fixes gh-4543

Update `ResourceBundleCondition` to only enable the messages source
if `messages.properties` (and not `messages*.properties`) exists. This
operation is much faster that performing a pattern match since a full
jar entry scan is not required.

Since adding `messages.properties` is good practice and this change
allows us to delete the custom `PathMatchingResourcePatternResolver`
it seems like a fine compromise to make.

Fixes gh-4930
See gh-4811

Closes gh-5003