this patch contains a major refactor of the nsx v3 tests
which have nsx rest api calls in their execution stack.
in particular it removes the global module level patching
that's current done as this type of global patching has
intermittent failures when testr runs tests in parallel.
these failures become more prevalent when the psec
code + tests are added. thus this patch is needed for
the psec drop I have.
NB: as noted in the code, most of the module level
patching / mocking magic can go away once we move
the current functional logic to a rest resource model.
Change-Id: Idec72c464a4a2771f089b840aae129d42816a35f
eac5453721