Maven release v2.3.0 (#2485)
Maven release v2.3.0 (#2485)

* [Gradle Release Plugin] - pre tag commit:  'v2.3.0-maven'.

* [Gradle Release Plugin] - new version commit:  'v2.3.1-SNAPSHOT-maven'.
GoogleContainerTools/jib,GoogleContainerTools/jib,GoogleContainerTools/jib,GoogleContainerTools/jib