src/pmclient/pmclient_fg.python: fix logic errors
src/pmclient/pmclient_fg.python: fix logic errors

1. loop iteration was wrong ... with -s N it was quitting one iteration
   too soon
2. the conditional logic for ncpu == 1 was just plain wrong

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