When the context is closed, FileWritingMessageHandler is stopped and
it closes its output files. However, it appears to do so in a manner
which means that they may be closed after the call to close the
context is completed. This causes problems on Windows as files that
are still open cannot be deleted.

This commit adds a workaround to SampleIntegrationApplicationTests
so that it makes up to 10 attempts each 0.5s apart to clean up the
input and output directories.

The intent of the test is to:

1. Make a change
2. Sleep for long enough for that change to be picked up
3. Make another change
4. Stop that watcher after 1 further scan has been performed
5. Assert that a further scan was performed by checking that two
   separate sets of changes (step 1 and step 3) have been picked up

Previously, step 2 relied on simply sleeping for a period of time
longer than the polling interval. In reality, the polling interval
is only a minimum time between scans and the actual time between them
depends on thread scheduling, GC pauses, etc. This lead to the
test failing intermittently if the scan didn't happen in a timely
manner.

This commit removes the sleep and replaces it with a while loop that
waits for first change to be picked up. This ensures that the second
change will be detected separately from the first and that two
separate change sets should always be available once the watcher has
stopped.

See gh-7782

* pr/8001:
  Prevent unnecessary debug log message creation

Closes gh-8001

* pr/8004:
  Polish contribution
  Polish

Closes gh-8004

See gh-8004

Previously, in the DevTools integration tests, portions of a File's
path were used to create the name of a jar entry. On Windows this
resulted in the entry containing \ characters. As a result the
directory structure was incorrect and the classes could not be loaded
from the jar.

This commit ensures that any \ characters are replaced with /
characters.

See gh-7782

Closes gh-7980

Closes gh-5996

Previously, the beans endpoint would only expose the context that
contained the endpoint. This commit updates the endpoint so that
the context that contains the endpoint and all of its ancestors are
exposed.

In a context hierarhcy, the relation ship is child -> parent and there
is no way to navigate from a parent to a child. As a result, any
contexts that are descendants of the context containing the endpoint
are not exposed.

Closes gh-5188

* pr/7905:
  Polish contribution
  Add LDAP health actuator

Closes gh-7905

Provide specific health actuator endpoint to verify if LDAP connection
is valid.

See gh-7905

Spring Boot provides now a LDAP starter based on this work so this
reference is no longer needed.

* pr/7997:
  Add Infinispan starter reference

Closes gh-7997

This commit provides an order of zero for the RepositoryRestConfigurer
that is used internally to configure the `RepositoryRestConfiguration`. In
practice, an unordered `RepositoryRestConfigurer` will run after ours.

Closes gh-7981

* pr/7995:
  Improve `UserInfoTokenServices` logging

Closes gh-7995

* gh-4902:
  Test that double registration of ServletContextInitializers does not happen
  Avoid double-reg when a Servlet or Filter implements ServletContextInitializer

Closes gh-4902

See gh-4902

* pr/7994:
  Fix Neo4j session documentation

Closes gh-7994

* pr/7993:
  Document use of `OpenEntityManagerInViewInterceptor`

Closes gh-7993

* pr/7914:
  Polish contribution
  Allow lowercase logger level on MVC endpoint

Closes gh-7914

See gh-7914

* pr/7916:
  Polish contribution
  Polish samples list in readme

Closes gh-7916

See gh-7916