Add post processors to ensure that SchedulerFactoryBean and Scheduler
beans depend on the Flyway and Liquibase beans.

See gh-17539

Fixes gh-17579

Fixes gh-17541

Closes gh-17814

Closes gh-17933

Update the reference guide with a note about using environment variables
to configure logging.

Closes gh-17958

This reverts commit f6f99d78 as 9.4.20
includes an incompatible class change where an abstract class in
Jetty's public API was changed to an interface, making it incompatible
with Framework 5.1.9.

See gh-18035

Closes gh-18043

Closes gh-18042

Closes gh-18041

Closes gh-18040

Closes gh-18039

Closes gh-18038

Closes gh-18037

Closes gh-18036

Closes gh-18035

Closes gh-18034

Closes gh-18033

Closes gh-18032

Closes gh-18031

Closes gh-18030

Closes gh-18029

Closes gh-18028

Fixes gh-18018

Closes gh-17975

Closes gh-17988

Update the reference documentation to use versioned links rather then
`/current/` whenever possible.

Closes gh-18000

Update reference documentation source to use consistent attribute names
and fix a few formatting issues.

Fixup ignore logic in `EndpointRequest`.

See gh-18012

Closes gh-18002

Update the reference documentation so that "Web Application Conditions"
also covers reactive contexts.

Closes gh-18005

Fix caching issues in `ApplicationContextRequestMatcher` and allow
subclasses to ignore an application context entirely. Update existing
matcher implementations so that they deal with the management context
correctly.

Prior to this commit, the `ApplicationContextRequestMatcher` would
return a context cached from the first request. It also didn't
provide any way to ignore a context. This meant that if the user was
running the management server on a different port the matching results
could be inconsistent depending on if the first request arrived on
the regular context or the management context. It also meant that we
could not distinguish between the regular context and the management
context when matching.

Closes gh-18012

* gh-18015:
  Remove reference to non-existent --edit option in CLI docs

Closes gh-18015

See gh-18015

Update reference documentation to use one sentence per line formatting
as recommended by the Asciidoctor team.

Closes gh-12445

* gh-17976:
  Use exec when launching the JVM in CLI's shell script

Closes gh-17976

Previously, when the Spring Boot CLI ran the Java command line for an
application it did a straight invocation which suppressed propagation of
signals to the JVM in certain circumstances (e.g within Docker containers).

This change prepends the command with exec which causes the Java process to
replace the script process in a shell ensuring that signals are propagated to
the Java process without suppression.

See gh-17976
Signed-off-by: Ben Hale <bhale@pivotal.io>

* gh-17984:
  Test the Gradle Plugin against Gradle 5.6.1

Closes gh-17984