[GCE] New module: Google Cloud Spanner (#21731)
[GCE] New module: Google Cloud Spanner (#21731)

* [GCE] Google Cloud Spanner module

Supports the creation/updating/deletion of Spanner instances and create/drop databases.

* [GCE] On update, node count will not be reset to one if not specified.

* [GCE] fixed some imports.

* [GCE] rename display_name to instance_display_name

* [GCE] Recreate instance in order to have desired values at create time.

* Fix linter error on imports

* [GCE] Added force_instance_delete option to ensure an instance is not removed by mistake.

* [GCE] Google Cloud Spanner module

Supports the creation/updating/deletion of Spanner instances and create/drop databases.

* [GCE] On update, node count will not be reset to one if not specified.

* [GCE] rename display_name to instance_display_name

* Fix linter error on imports

* fixed doc bug

* Remove imports mistakenly brought in during merge

thaim/ansible,thaim/ansible