Adds non-volume-support to create server with heat

Reasons:
- There is no supporting code for CONF.trove_volume_support = False.

Changes:
- Added code for CONF.trove_volume_support = False.

Change-Id: I048169e20c3ac713f44e7df85e6b691b707fa88c
Closes-Bug: #1262357
Corrects the help message for trove_volume_support

Reasons:
- trove_volume_support has wrong help message in cfg.py code.

Changes:
- Corrected the help message.

Change-Id: I96ce1fe669d52d5c3fec81dd51b80f1fbe01ebfd
Closes-Bug: #1262398
Merge "Corrects the help message for trove_volume_support"