src/pmlogger/pmlogger_daily.sh: send -V diags to stderr
src/pmlogger/pmlogger_daily.sh: send -V diags to stderr

Found a case where -V on the command line causes the script to die
horribly because one of the functions (_get_non_primary_logger_pid())
confused the caller when verbose diagnositics were interlaced with the
expected output on stdout.

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