Subject: remove OSTNG references. Make client change for
request prefetch. add safe dictionary checking for arbitrary
data.

removed the OSTNG reference common/models.
Added a method to check the dictionary of arbitrary data
sent in from the command line that won't blow up on a keyError.
requests made a change from prefetch to stream and inverted
the logic.

Change-Id: I8741640912485cf3c631eee20a0bddb8c2f9a714
generic approach to mock tests so assertions can be shared

 - fixing up client
 - removed unecessary schema model
 - cherry-picked duplicate changes
 - add rotating responses
 - continued with mock test strategy
 - move metatests to root folder

Change-Id: I1b484e3959fbea5b7e3643fd2831f44ba82e9b1c
fixing images v2.0 model/client to make tests pass

Needed by
Change-Id: Ia889aec302f2f43d3a1ffbb1b63ad59b85fc4133

 - rebased with dependency
 - using explicit mapping and _remove_empty_values to create model dict
   now
 - implement sotring of raw image data
 - fixing serialization of image model
 - cherry-picked from a fast-forward commit

Change-Id: Ifb0f895a2d9d18bad6e912c9b446394c1a94ad73
Merge "Subject: remove OSTNG references. Make client change for request prefetch. add safe dictionary checking for arbitrary data."
Merge "generic approach to mock tests so assertions can be shared"
Merge "fixing images v2.0 model/client to make tests pass"