See gh-5901

While working on gh-5309, a regression was introduced and fixed right the
way on master. Unfortunately, the fix wasn't applied to `1.3.x` as it
should have been.

This commit applies 6dd84159 to `1.3.x`

Closes gh-5901

- Use the latest Docker image for Ubuntu 14.04 LTS based tests
- Add Ubuntu 16.04 LTS based tests

Closes gh-5868

* pr/5887:
  Upgrade to Spring AMQP 1.5.6

Closes gh-5887

Closes gh-5885

Closes gh-5322

This reverts commit d6a424f9.

Closes gh-5361

# Conflicts:
#	spring-boot/src/test/resources/org/springframework/boot/env/test-encoded.properties

Closes gh-5874

Closes gh-5873

Closes gh-5872

Closes gh-5871

Closes gh-5858

Closes gh-5819

ErrorMvcAutoConfiguration creates a BeanNameViewResolver bean in case
the user has used @EnabledWebMvc and disabled WebMvcAutoConfiguration.
If the user hasn’t used @EnabledWebMvc, WebMvcAutoConfiguration will
creates its BeanNameViewResolver and override the one that’s already
been defined by ErrorMvcAutoConfiguration.

This commit makes WebMvcAutoConfiguration’s BeanNameViewResolver
definition conditional on there being no existing BeanNameViewResolver
bean definition.

Closes gh-5354

See gh-5322

It seems like a base class that defines `@Beans` just doesn't
define any beans. Oh well, time to copy-paste.

to stop it from being included in the enclosing @Configuration.

That way, if the app is not a web app, then there really is a
client_credentials OAuth2 resource (as claimed in the user guide).

Fixes gh-5735

Closes gh-5823

Closes gh-5811

Previously, if a void method with a single argument was named "set", the
annotation processor wrongly considered it was a setter candidate. This
commit updates the condition to ignore it.

Closes gh-5826

Closes gh-5829

Rabbit client 3.6.* uses TLSv1.1 as the default algorithm which
many brokers are deisabling these days. Spring AMQP supports
changing the algorithm by name, so this is just a pass thru for
that.

Closes gh-5166

Closes gh-5782

Closes gh-5751

Closes gh-5786

It sometimes has to catch an exception from the security filter so
it needs to be before, and somehow this hasn't been a problem up to
now, but probably only by some fluke.

Fixes gh-5792

Before this change the app context closes and metrics that have not
yet been exported ccan be orphaned. The design of this feature is simple:
use Closeable where possible, so that it will be called automatically
by Spring on shutdown.

Fixes gh-5771

The MetricCopyExporter has had the capability for a while to keep
track of counters internally. This change aligns that with the
PrefixMetricGroupExporter.

Fixes gh-5762

Closes gh-5757

Closes gh-5446

Previously, the web application context was only set on the
ServletContext in a full-blown integration test or when MockMvc was
used.

This commit updates SpringApplicationContextLoader so that the context
is also set on the context in a plain web application test (one where
MockMvc is not being used). The change is a partial backport of commit
7dffb702.

Closes gh-4370

Previously, there were two problems with DevTools’ DataSource
auto-configuration:

1. It did not tolerate a context with multiple DataSources
2. It would attempt to shut down a DataSource that had not been created
   by DataSourceAutoConfiguration and, therefore, where we could not be
   sure of its configuration.

This commit updates DevToolsDataSourceAutoConfiguration so that it backs
off unless the context contains DataSourceProperties and a single
DataSource created by DataSourceAutoConfiguration. This ensures that it
can safely use DataSourceProperties to get the DataSource’s
driver class name and accurately determine if it’s an in-memory or
external database. Shutdown is only called for an in-memory database.

Closes gh-5540

Closes gh-5664