Add tests to ensure snapshots across replicas

Related-Bug: #1546303
Depends-On: Ia4cd2a36e31418e7a3d1c218080caa632755fe16
Depends-On: Id318a4adc0faf64a4bef57252aa2f0d9083b82b1
Change-Id: I269225b976efe13b2cbb9e0648d541a063df70e5
3 files changed
tree: 7f70aa7ca1a133c894ac4a950ea3e86e12a4fbae
  1. manila_tempest_tests/