Closes gh-8423

Closes gh-8443

* pr/8143:
  Fix indentation
  Clarify usage of @ImportResource in doc

Closes gh-8143

See gh-8143

* pr/8460:
  Upgrade to Spring Integration 4.3.8.RELEASE

Closes gh-8460

* pr/8227:
  Refine engine counter logic
  Polish web containers stop contribution
  Ensure web containers are stopped after close

Update counter logic to prevent negative values. Since the stop method
can now be called more than once, it was possible for the counter to
move into negative values.

See gh-8227

See gh-8227

Update `EmbeddedServletContainer` implementations to ensure that stop
can be called even if start has not. This allows servers that are
partially started during `initialize()` to still be shut down.

This commit fixes a regression caused by commit 0af53b36.

See gh-8036
Fixes gh-8224
Closes gh-8227

Update `HealthMvcEndpoint` to respect `ManagementServerProperties`
roles. Prior to this commit the `HealthMvcEndpoint` directly loaded
roles rather than using bound properties. This meant that list values
from yaml were not respected.

Fixes gh-8314

Update DataSourceInitializedPublisher to always attempt to obtain the
published DataSource directly from the EntityManager. In the case where
the EntityManager doesn't provide a DataSource, the previous logic is
used.

Fixes gh-8296

* gh-8458:
  Upgrade to Spring AMQP 1.6.8.RELEASE

Closes gh-8458

Closes gh-8354

Closes gh-8450

Closes gh-8449

Closes gh-8448

Closes gh-8447

Closes gh-8446

Closes gh-8269

Closes gh-8439

Previously, there were a number of inconsistencies in the embedded
containers' handling of static resources. The Servlet spec requires
that static resources can be served from the META-INF/resources/
directory of jars nested inside a war in WEB-INF/lib/. The intention
was also to extend this to cover jar packaging when jars are nested in
BOOT-INF/lib/. This worked when using Tomcat as long as Jasper was on
the classpath. If you didn't have Jasper on the classpath or you
were using Jetty or Undertow it did not work.

This commit updates the configuration of embedded Jetty, Tomcat, and
Undertow so that all three containers handle static resources in the
same way, serving them from jars in WEB-INF/lib/ or /BOOT-INF/lib/.
Numerous intergration tests have been added to verify the behaviour,
including tests for Tomcat 8.0 and 7.0 which is supported in addition
to the default 8.5.x. Note that static resource handling only works
with Jetty 9.3.x and 9.2 and earlier does not support nested jars (
see https://github.com/eclipse/jetty.project/issues/518 for details).

Closes gh-8299

Closes gh-8248

See gh-8443

* gh-8252:
  Polish "Ignore spock.lang annotations when creating test context cache key"
  Ignore spock.lang annotations when creating test context cache key

See gh-8252

See gh-7524
Closes gh-8252

See gh-8435

Update Microsoft SQL Server detection logic to retain "SQL SERVER"
support (just in case the server string is driver specific).

See gh-8222

In Logback 1.1.10, the logback-classic module contains a
META-INF/services/javax.servlet.ServletContainerInitializer file that
contains a comment. This triggers a bug in Wildfly 8 [1] that has been
fixed [2] in Wildfly 9 and later. As a result, this commit also
updates our Wildfly deployment test to use 9.0.2 rather than 8.2.0.

Closes gh-8354

[1] https://issues.jboss.org/browse/WFLY-4089
[2] https://github.com/wildfly/wildfly/commit/fef57ebdc7f93fe975d9234dd86265b79d705ce2

This reverts commit 05113d05.

See gh-8354

Closes gh-8364

Closes gh-8363

Closes gh-8362

Closes gh-8361