Created gce_snapshot module (#20057)
Created gce_snapshot module (#20057)

* Added support for a gce_snapshot module for managing snapshots in the Google Cloud Platform

* Fixed using sys.exit in favor of fail_json. Followed the pattern in gce_pd

* Fixed using sys.exit in favor of fail_json. Followed the pattern in gce_pd

* Fixed an issue when dealing with multiple disks. Added a bit more documentation explaining the disks argument

* Corrected a typo in the multi-disk snapshot example

* Updated module to return list of changed snapshots instead of just a message. Added a RETURN block

thaim/ansible,thaim/ansible