Integration test create scaling group with blank image ID, remove negative test with empty image ID
Integration test to update launch config with a blank image ID
Update functional tests to test for None image ID also
Add a system test that ensures a server with an empty image was created
Add a todo for the system test
Hack to allow a null argument to CreateServer, since cloudcafe removes parameters with None arguments
Lint fix
Change flavor back in update tests - the flavor change is not being tested
Merge pull request #712 from rackerlabs/bfv-no-image-validation-tests

BFV - no image validation, integration tests