Previously, if a bean of type `CacheResolver` was present in the context
the whole cache auto-configuration would back off. If said
`CacheResolver` hasn't been defined via the `CachingConfigurer`
infrastructure, the application context would fail with a rather
unpleasant error message.

It can be quite common to define custom `CacheResolver` beans as the cache
annotations allow to defines custom cache resolvers per operation. This
commit makes sure that the cache auto-configuration will back-off only if
the `CacheResolver` is named `cacheResolver`.

Closes gh-5201

Previously, Animal Sniffer checking of spring-boot-loader-tools
was disabled as it failed with an NPE. This has been fixed in
Animal Sniffer 1.15.

This commit upgrades Animal Sniffer to 1.15 and adds the necessary
annotations to suppress failures for safe usage of sun.* and Java 7
APIs.

Note that UsesUnsafeJava has been copied from spring-boot and made
package-private. This retains the clearer intent of the custom
annotation (versus @IgnoreJRERequirement) while avoiding the change
in the build order that would be necessary for
spring-boot-loader-tools to use the annotation from spring-boot.

Closes gh-5284

See gh-4903

* pr/4903:
  Polish contribution
  Add Caffeine cache support

Closes gh-4903

See gh-4899

Closes gh-5274

Previously, if DataSourceAutoConfiguration had been explicitly excluded,
DevToolsDataSourceAutoConfiguration would cause refresh to fail due to
a missing DataSourceProperties bean. This commit corrects the condition
so that the auto-configuration is conditional on a DataSource bean and
a DataSourceProperties bean rather than only being conditional on one or
the other.

Closes gh-5269

Previously, the launch script integration tests used Jackson 2.1 to
align with the requirements of docker-java 2.x. This stopped working
when we upgraded to Spring Framework 4.3 which requires Jackson 2.6+.

This commit updates the launch script integration tests to use
docker-java 3.0.0-RC1 which is compatible with Jackson 2.6.x. An added
benefit is that 3.0 also adds support for copying an archive to a
container, allowing the custom command that performs this function to
be removed.

Closes gh-5278

* pr/5204:
  Polish contribution
  Add CONF_FOLDER property

Closes gh-5204

Closes gh-5203

See gh-4900

* pr/5254:
  Fix logger classname

Closes gh-5254

Closes gh-5237

Closes gh-5252

Closes gh-5251

Closes gh-5250

Closes gh-5249

Closes gh-5248

Closes gh-5247

Closes gh-5246

Closes gh-5245

Closes gh-5244

Closes gh-5243

Closes gh-5242