Lock pv., pvcs. and pvcrs test automatically from running simultaneously

Some of the XML tests will write out a file and then read it back in and instead of making it a serial test we really just need to make sure it doesn't run simultaneously with the other pv., pvcs. or pvcrs tests so creating a lock based on the xml script to lock the tests out from running simultaneously which should still allow them to run in parallel with other tests and do it automatically with the testing macros.