Rather than always returning JSON or YAML, add functionality to
return table responses when applicable for ease of reading.
Adds some marker exceptions to the Shipyard API Client to handle
cases where the user of the client would generally want to take a
specific and repeatable course of action instead of handling the
response in a case-by-case basis.
Moved cli action testing to use the responses library instead of
as many internal mocks. Added test response generators for standard
api responses.
Change-Id: I3a593fb29b6e76d971adc7f3bb3a4b7f378ed091
b6d7af07fa