- Code formatting
 - Javadoc warnings
 - Deprecation warnings

Upgrade to Jetty 9.2.15 and replace use of API that was deprecated
and changed to throw an UnsupportedOperationException in the same
release.

Closes gh-5218

Closes gh-5212

Closes gh-5224

Closes gh-5223

Closes gh-5222

Closes gh-5221

Closes gh-5220

Closes gh-5219

Closes gh-5217

Closes gh-5216

Closes gh-5215

Closes gh-5214

Closes gh-5213

Closes gh-5211

The Eclipse compiler is perfectly happy with the original code, but
javac is not. This commit adds some explicit typing to keep javac
happy.

This commit allows to customize the auto-configured `CacheManager` by
exposing a bean of type `CacheManagerCustomizer`. The implementation may
reference the type of a `CacheManager` to determine in which case it has
to be invoked.

Several implementations can be provided and ordered using the regular
`Ordered` interface and `@Order` annotation.

Closes gh-5039

Previously, if endpoints.enabled was false setting
endpoints.docs.enabled=true or endpoints.actuator.enabled=true would
have no effect as their entire configuration class was conditional
on endpoints.enabled being true.

This commit updates the conditions on the configuration class so that
it is conditional on either the actuator or docs endpoint being enabled.

Closes gh-5007

* gh-5032:
  Fix logic for disabling plugins in CrshAutoConfiguration

Plugin disabling logic was broken by e009d3e4. Prior to this change,
a plugin would be disabled if it or any of the implemented interfaces
in its inheritance hierarchy were configured as being disabled. The
offending commit inverted the logic so that the plugin would be
enabled if any part of it was NOT configured as being disabled.

This commit restores the logic such that the early return happens only
in the negative case.

Previously, the tests were written as though
PluginContext#getPlugin(Class) would consider the specified class
against the runtime type of the plugin (not an unreasonable
assumption); rather this method considers the broader 'plugin type'.
This commit rewrites the test to seek by plugin type and assert the
absence of the disabled plugins.

Closes gh-5032

Closes gh-5147

* gh-5168:
  Tag Docker images created by launch script integration tests

Closes gh-5168

Closes gh-5119