Cloud Resource Manager error message swap

[ajkannan]

403 forbidden (permission denied) is returned instead of 404 not found when a project doesn't exist. For the time being, we will assume 403 means the project wasn't found. We should change back our implementation once this is fixed.

Also, 400 bad request is returned when attempting to perform actions on a project that is in an incorrect lifecycle state. This may make more sense with error code 412 (precondition failed) according to the public documentation, since the error message contains the message "precondition check failed."

[ajkannan]

The 403 vs 404 is intended behavior, and a check for 404 is added in #491, and the 400 vs 412 isn't a pressing or obvious issue, so I'm closing this issue.