Implement stack restore

This adds a new stack restore method to restore a snapshot.

blueprint stack-snapshot
Co-Authored-By: ala.rezmerita@cloudwatt.com

Change-Id: Iddf5ab5e639990a857a2e2acd05133bce42544b3
Merge "Implement stack restore"
Updated from global requirements

Change-Id: Ic65b03156f50b70045153938a3a7e35fa3856e66
Imported Translations from Transifex

For more information about this automatic import see:
https://wiki.openstack.org/wiki/Translations/Infrastructure

Change-Id: I0641da33411e307d5c38d541098e8a26e1960773
Merge "Imported Translations from Transifex"