Removes calls to mock.patch.stopall in unit tests
Removes calls to mock.patch.stopall in unit tests

Removes unnecessary calls to mock.patch.stopall
in individual unit tests since it is now
automatically called from the base test case.

Closes-Bug: #1291130
Change-Id: Ia8e82d6a9a9bc9bd5f48146c1be53069ff1cdb01

moshele/old-networking-mlnx