Add update image member and update image negative

*Updated update image member module to reflect cloud cafe changes
*Updated update image negative module to reflect cloud cafe changes
*Updated modules aesthetic consistency
*Updated test steps to make more sense
*Added validation for image properties on top of response code
*Added abstract method for negative image id tests
*Removed test_patch_image module since tests are covered elsewhere
*Updated abstract method name for better clarity
*Removed default value for abstract method and fixed indentation

Change-Id: I090a771ed3bdd6522b5e6433d307d63407da080b
Merge "Add update image member and update image negative"