Boot server from encrypted volume

This patch adds support for booting a server from an
encrypted volume while using luks encryption method.

Note: manager.create_server method passes wait_until='ACTIVE',
so 'create_test_server' function in common/compute.py waits
until the server status is 'ACTIVE'.

Change-Id: Ibd05252976499daaaafc658e3f3a920398b53420
3 files changed