GoogleCloudPlatform/kubernetes — pull request #900 by thockin (2014-08-14 20:55:30+00:00)
Title: Move validation errors into a pkg

This is a precursor to fixing my other PR about error lists - That one is on hold until this or something like it goes in.

This makes ErrorList a public type, but does not implement the error interface on it (because I think we want an empty list to not be an error). ErrorList.ToError() produces an error or nil if the list is empty. I put it under api/errors, because that is what it is used for, and the Make* functions are sort of validation-centric.