Add test that verifies Ceph partitions mount after reboot

Added test that mounts Ceph partitions after warm and
cold reset of Ceph nodes.

Closes-bug: #1269802

Change-Id: Ibcfbc8c558e987616f7e1feb784c61de5658dbab
Merge "Add test that verifies Ceph partitions mount after reboot" into stable/4.1