Depending on the order of execution our unit tests could fail because we
are caching the reset methods in the RESET_STATE_RESOURCES dictionary in
cinderclient.v3.shell and mocking the methods before importing this file
will leave future tests with the mocked value.
This patch fixes this by mocking find_resource instead of individual
find methods, and in one of the tests with a method that will call
original method whenever it's not the call we actually wanted to mock.
Change-Id: Ic3ab32b95abd29e995bc071adc11b1e481b32516
Closes-Bug: #1705249