Fix unit test failures related to new os-client-config and osc-lib

[breakage related to os-client-config 1.28.0]
os-client-config 1.28.0 add a check if filebased and envvars are
both used. This check causes OSC unit test failure.

OSC now instantiates OpenStackConfig twice as a workaround.
The unit test mocks _load_config_file() and it returns a config dict,
but os-client-config OpenStackConfig.__init__ updates the dict returned.
As a result, when OpenStackConfig is instantiated second time,
the mock of _load_config_file returns a modified version of the config
dict. This hits the new check in os-client-config 1.28.0.

This commit changes the mock to use side_effect rather than return_value
to ensure the original dict is used.

[breakage related to osc-lib 1.7.0]
The change in osc-lib 1.7.0 added "if" logic to avoid calling get() twice.
In tests.unit.volume.test_find_resource, kwargs is empty dict in find_resource(),
so the second call to get() is NOT called now.
Removing the second elements of side_effect addresses the unit failure.

Co-Authored-By: Rui Chen <chenrui.momo@gmail.com>
Change-Id: Ib9d14661b2755bbd6619e15c0d9023fbc9d27d70
Closes-Bug: #1703782
Closes-Bug: #1703783

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