Change image client methods to return one value
Tests were updated along with verify_tempest, cleanup, javelin.
There were two methods in the clients where the body is a string. Since
strings are immutable a more complicated way would have to be created to
return a single value that could be used transparently by clients. So
these methods continue to return (response, body).
Partially implements: blueprint clients-return-one-value
Change-Id: Id6a728d1ea1cf233ae580fdcd305dc42a4f3610f
21 files changed