It has been mentioned a number of times that the self.requests naming
for the requests_mock object is confusing between whether you are
actually sending a request or are mocking a request.
Rename all entries of the requests object to requests_mock.
This cleans up a couple of entries where the older register_uri format
was being used in favour of using the HTTP method as the requests_mock
method.
Change-Id: I315085b4088130b510f9dbd696011d983598372c
4822d8bb9d