Currently after calling the cinderclient to create an image from a volume,
it also then tries to create another image. This fails as the keyword
volume is unexpected. This add checks so the image is not created in
this case. Allowing --volume to not throw an error when it has worked.
Change-Id: I67e650eb0b8c331d86515e3e326c39a5d6dad5e1
Closes-Bug: 1497221
1afd8f62cd