Add --volume option to image create command

Add ability to create an image from a volume.
* Added --volume command to image create
* Added --force option to image create
* Added block to access volume manager in image create
* Tests added for the volume option

Change-Id: I3910a2b5e04acd0d15dd230747ba6ebca07aa316
Closes-Bug: #1207615
Merge branch 'release-0.3.1' into dt-test