Bumping to 1.0.0-rc3-SNAPSHOT, 0.15.1-beta-SNAPSHOT, 0.15.1-alpha-SNAPSHOT (#1977)
Bumping to 1.0.0-rc3-SNAPSHOT, 0.15.1-beta-SNAPSHOT, 0.15.1-alpha-SNAPSHOT (#1977)


googleapis/google-cloud-java,googleapis/google-cloud-java,googleapis/google-cloud-java