qa/230: _get_pids_by_name() needs -a to find drain-server QA process
qa/230: _get_pids_by_name() needs -a to find drain-server QA process

Also, make sure any zombie drain-server from another life is killed
off before starting, to avoid bind() failing with addr in use error.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp