Don't duplicate the existing config file list

Make a copy of the original config file list for test_v3.
Otherwise additional tests end up appending to them and corrupting other tests.

Change-Id: I4232956dbfea4b1b7103c751e35112daddc5ff37
initialize environment for tests that call popen

Change-Id: I5b367f7f97de353f12e41dc7768a7fcdc740eabd
Merge "Don't duplicate the existing config file list"
Merge "initialize environment for tests that call popen"