qa/455 - rsyslog pmda testing
qa/455 - rsyslog pmda testing

A couple of changes needed here:
a) maintain pmcd configuration state ... if the PMDA is installed
   before this test runs, make sure it is installed after the test
   has been run, else if the PMDA is NOT installed before this
   this test runs, make sure it is NOT installed after the test
   has been run
b) add a small amount of checking for the named pipe creation
   ($PCP_LOG_DIR/rsyslog/stats) to avoid a race between the Install
   and the QA test that can leave the QA test hanging on the write
   to the named pipe.

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