INT-3394: Use Jedis Client in Tests

JIRA: https://jira.spring.io/browse/INT-3394

INT-3394: Restore `awaitContainerSubscribed`
INT-3398 Polish Javadocs

JIRA: https://jira.spring.io/browse/INT-3398
INT-3399 Update spring-retry to 1.1.0

JIRA: https://jira.spring.io/browse/INT-3399

Fix `MessagingTemplate` javadoc warn
Add the Spring IO Platform plugin
INT-3396: Polishing

JIRA: https://jira.spring.io/browse/INT-3396
Updates for latest snapshots of the Spring IO plugin

Update the configuration to use the renamed plugin. Add a dependency in
the springIoVersions configuration that points to the versions published
by Spring IO.
Upgrade to 0.0.3.RELEASE

Upgrade the plugin version to 0.0.3.RELEASE. Only apply the plugin if
the platformVersion property has been set.