This change adds common methods which allow resources
to handle client exceptions without needing to directly
import the exception types.
The most common client resource exception handling is:
* Detecting if an exception is a 404
* Raising any exception which is not a 404
* Detecting if an exception is a 413 (over limit)
* Detecting if an exception was raised by a particular client
library
Subsequent changes will move to using these methods.
Change-Id: Ib2bd55c31e66b562cfa8388beb450be6c06cc4fb
9b6d38cd02