Gradle release v1.0.0-rc1 (#1368)
Gradle release v1.0.0-rc1 (#1368)

* [Gradle Release Plugin] - pre tag commit:  'v1.0.0-rc1-gradle'.

* [Gradle Release Plugin] - new version commit:  'v1.0.0-SNAPSHOT-gradle'.

GoogleContainerTools/jib,GoogleContainerTools/jib,GoogleContainerTools/jib,GoogleContainerTools/jib