Rework the gfs2 qa test handling of trace file enablement
Rework the gfs2 qa test handling of trace file enablement

Needs to take care that superuser privilege has been aquired,
and if the file doesn't exist, we need to use _notrun rather
than failing the test with an echo message.

edwardt/pcp,prasincs/pcp,adfernandes/pcp,aeg-aeg/pcpfans,tjanez/pcp,prasincs/pcp,adfernandes/pcp,andyvand/cygpcpfans,edwardt/pcp,mbaldessari/pcp,adfernandes/pcp,andyvand/cygpcpfans,andyvand/cygpcpfans,edwardt/pcp,aeg-aeg/pcpfans,wuliming/pcp,edwardt/pcp,tjanez/pcp,mbaldessari/pcp,mbaldessari/pcp,wuliming/pcp,wuliming/pcp,mbaldessari/pcp,prasincs/pcp,tjanez/pcp,prasincs/pcp,edwardt/pcp,wuliming/pcp,aeg-aeg/pcpfans,wuliming/pcp,adfernandes/pcp,andyvand/cygpcpfans,andyvand/cygpcpfans,prasincs/pcp,aeg-aeg/pcpfans,mbaldessari/pcp,adfernandes/pcp,tjanez/pcp,tjanez/pcp,aeg-aeg/pcpfans,prasincs/pcp,adfernandes/pcp,mbaldessari/pcp,tjanez/pcp,aeg-aeg/pcpfans,wuliming/pcp,adfernandes/pcp,edwardt/pcp,edwardt/pcp,andyvand/cygpcpfans,tjanez/pcp,andyvand/cygpcpfans,wuliming/pcp,adfernandes/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,prasincs/pcp,aeg-aeg/pcpfans,tjanez/pcp,wuliming/pcp,edwardt/pcp,prasincs/pcp