pmie - day one bug in fetch logic
pmie - day one bug in fetch logic

On the first fetch and the fetch after a dynamic instance domain
has changed membership, the values may have been incorrectly
marked as "not valid", preventing rules being evaluated correctly.

Part 1 of the bug Chandana de Silva discovered with this simple
pmie rule:
    count_inst( match_inst "httpd" proc.psinfo.pid > 0)  > 0
	-> print "count %v";
that reported 6 most of the time, and sometimes reported 1400+

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