GA google_container_cluster maintenance policy recurring window (#3288) (#401)
GA google_container_cluster maintenance policy recurring window (#3288) (#401)

* GA release_channel and maintenance window recurring policy

* Un GA release_channel, it is not ga

* Move validate to validation.go, GA diff suppress too

* Ga test too

Signed-off-by: Modular Magician <86ce7da8ad74b1c583667a2bebd347455fa06219@google.com>
GoogleCloudPlatform/terraform-google-conversion