qa: fix pmcd startup detection race in test 169
qa: fix pmcd startup detection race in test 169

The code in test 169 checking for running pmcd processes
could get confused by the presence of pmcd_wait from the
start scripts.  Since _wait_for_pmcd uses pmprobe-in-a-
loop, its possible pmcd can be available while pmcd_wait
is still running.  The test filters failed to account for
this other process with pmcd-alike full path, so simply
cull pmcd_wait from the output before counting daemons.

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