* pr/5828:
  Make json-path and selenium-api optional

Make json-path and selenium-api optional in spring-boot-test and
spring-boot-test-autoconfigure.

Fixes gh-5828

* pr/5830:
  Allow customization of AuditListener

Introduce `AbstractAuditListener` so that users can extended it to
replace the auto-configured default.

Fixes gh-5830

* pr/5831:
  Update getting-started.adoc

Fixed path for bash completions

Closes gh-5831

* pr/5836:
  Polish

Closes gh-5836

Add @AutoConfigureCache annotation to configure the specific cache
manager to use with a test. By default the NoOpCacheManager is used.

The @JsonTest, @DataJpaTest and @WebMvcTests have also been updated to
use the annotation.

Fixes gh-5765

Add additional @ConditionalOnMissingBean guards to session
configurations to ensure that the first wins. Also reorder imports
to prefer Redis over JDBC.

See gh-5158

* gh-5158:
  Polish spring session auto-configuration
  Polish session auto-configuration
  Spring Session auto-configuration expansion

This commit improves the initial submission by adding more tests and
more configuration options.

Closes gh-5158

See gh-5158

This implementation was inspired in large part by the cache
auto-configuration. In addition to the originally supported Redis, now
Hazelcast, an in-memory map, as well as a no-op option are supported. It
should be easy to extend this to include additional data stores in the
future.

Closes gh-3811

Closes gh-5823

Closes gh-5811

`JedisConnectionFactory` needs `commons-pool2` for quite some time now
and our auto-configuration had a special case to handle redis if
`commons-pool2` isn't available.

This commit removes that code as using it would lead to a failure anyway.

Closes gh-5718

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

* pr/5815:
  Polish

Closes gh-5815

Closes gh-5829

Update `spring-boot-sample-web-mustache` to show how convention based
status error pages can be used.

See gh-2691

Allow convention based status error pages. Static HTML or templates
can be used by placing the appropriately named file under a `/error`
folder. For example:

	/src/main/resource/templates/error/404.ftl
or	/src/main/resource/public/error/404.html

Pages can also be named after the status series (5xx or 4xx).

Fixes gh-2691

Closes gh-5816

Create ErrorPageRegistry and ErrorPageRegistrar interfaces that allow
error page registration to be a first class concern.

Prior to this commit ErrorPageFilter needed to implement
ConfigurableEmbeddedServletContainer in order to receive ErrorPage
registrations.

Closes gh-5789

Refactor code to move from recently deprecated classes.

Closes gh-5822

Reorganize web related classes for better separation of concerns.
Mainly this involves moving classes from `o.s.b.context.embedded`
that aren't directly tied to embedded servlet containers to
`o.s.b.web` and relocating everything from `o.s.b.context.web`.

See gh-5822

Move the @LocalServerPort to org.springframework.boot.context.embedded
since it's only really useful when working with embedded servlet
containers.

See gh-5822

Rework ServletComponentRegisteringPostProcessor to break the direct link
to the `org.springframework.boot.context.embedded` package.

See gh-5822

When Spring Security and its spring-security-test module are on the
classpath, `@WebMvcTest` will now auto-configure Spring Security and
configure its MockMvc-based test support. This behaviour can be
disabled using the new secure attribute on `@WebMvcTest` and
`@AutoConfigureMockMvc`.

Closes gh-5476

Previously, when @AliasFor was used, the value of the mapped property
would be incorrect as the value of the canonical attribute would be
used, rather than the value of the alias.

This commit updates AnnotationsPropertySource to use a merged annotation
as the source of attribute values, thereby ensuring that any aliased
attributes are configured correctly.

Closes gh-5821