We lost this testing when all instances were started prior to running the instances testpoints. This patch:
- checks if the create_image op exists on the running instance - if not, stops the instance - and checks if the create_image op now exists - if so, carries on with the test and creates the image - starts the instabce if it was stopped in step 2 I've dons some preliminary testing on RHEVM, Mock ... assuming that there will be little fallout for the providers that support image creation from a running instance (fgcp and c2) - where this code will just be skipped over.