Closes gh-19092

Closes gh-19091

* pr/19057:
  Remove invalid example of spring.mvc.async.request-timout property

Closes gh-19057

See gh-19057

Closes gh-19090

* pr/18961:
  Handle ApiVersion in CachingOperationInvoker

Closes gh-18961

Prior to this commit, ApiVersion was treated as a mandatory parameter in
CachingOperationInvokerAdvisor and thus prevented the
CachingOperationInvoker to kick in. By skipping ApiVersion in the same
way we're skipping SecurityContext we can avoid this.

In order to not return the same cached response, this commit also
changes the cache handling in CachingOperationInvoker to account for
different ApiVersions being passed.

See gh-18961

Closes gh-19088

* pr/19065:
  Test the Gradle Plugin against Gradle 6.0.1

Closes gh-19065

See gh-19065

Closes gh-19087

Closes gh-19086

* pr/19027:
  Polish "Fix logging in CloudFoundryVcapEnvironmentPostProcessor"
  Fix logging in CloudFoundryVcapEnvironmentPostProcessor

Closes gh-19027

See gh-19027

See gh-19027

Closes gh-19080
Co-authored-by: Stephane Nicoll <snicoll@pivotal.io>

See gh-19083

Closes gh-19082

Fixes gh-19081

See gh-19075

See gh-19076

See gh-19077

See gh-19069

See gh-19053

See gh-19054

See gh-19072

See gh-19068

See gh-19051

See gh-19068

Closes gh-19062

Closes gh-19061

Fixes gh-18908

Closes gh-19060