* pr/20223:
  Polish "Allow Embedded directory to be used without spring-data-ldap"
  Allow Embedded directory to be used without spring-data-ldap

Closes gh-20223

See gh-20223

See gh-20223

This commit relaxes the class condition to ConnectionFactory, checking
if the connection factory is a connection pool and bind its metrics to
the registry accordingly.

Closes gh-20349

* pr/20370:
  Use isEmpty() where possible

Closes gh-20370

See gh-20370

* pr/20380:
  Remove unused parameter in AsciidoctorConventions

Closes gh-20380

See gh-20380

See gh-18834

This commit adds a new auto-configuration for RSocket support in Spring
Integration.

Given an application with `spring-messaging`, `spring-integration-rsocket`
and RSocket dependencies, developers are now able to leverage Spring
Integration features with RSocket.

It is now possible to configure an RSocket server with
`"spring.rsocket.server.*"` properties and let it use
`IntegrationRSocketEndpoint` or `RSocketOutboundGateway` components to
handle incoming RSocket messages. This infrastructure can handle Spring
Integration RSocket channel adapters and `@MessageMapping` handlers
(given `"spring.integration.rsocket.server.message-mapping-enabled"`is
configured.

If the `"spring.integration.rsocket.client.host"` and
`"spring.integration.rsocket.client.port"` (for TCP protocol), or
`"spring.integration.rsocket.client.uri"`  (for WebSocket) is configured
then a `ClientRSocketConnector` will be configured accordingly.

Closes gh-18834
Co-authored-by: Brian Clozel <bclozel@pivotal.io>

Closes gh-20376

Closes gh-20375

* pr/20361:
  Upgrade CI images to Ubuntu Bionic 20200219

Closes gh-20361

See gh-20361

Closes gh-20359

Closes gh-20358

* pr/20355:
  Automate Ubuntu base image upgrade

Closes gh-20355

See gh-20355

* pr/20354:
  Polish "Add descriptions for data source pool metrics"
  Add descriptions for data source pool metrics

Closes gh-20354

See gh-20354

See gh-20354

* pr/20318:
  Polish tests

Closes gh-20318

See gh-20318

Translate IOException to DockerException for a more meaningful error
message when the Docker daemon is not available.

Fixes gh-20151

Closes gh-20340

* pr/20339:
  Remove redundant code

Closes gh-20339

See gh-20339

See gh-20329

Closes gh-20331

Closes gh-20329