I can change the name of the method.

But let me explain my rationale: As the feature request says, it's trying to validate the ID style against whatever format that keystone has for project id, which happens to be 32 hex string. So naming is_valid_keystone_project_id doesn't sound bad to me, since if KS changed the format to something else for example, we wouldn't need to change the caller side of the method (just change inside the method to check agains the new format). 

Actually is_valid_keystone_project_id_format, (with format at the end) might be better, since it's not actually validating the existence in KS.