allow for non-root user to run script.
As collectdmon handles its pidfile, this would require to change
COLLECTMONPIDIR to something else than only-root writeable /var/run

Change-Id: I45d2de9dcc976f3b1e18cef5b6b78eeca1d270b2
Signed-off-by: Florian Forster <octo@collectd.org>
contrib/redhat/init.d-collectd: Rename variable to …PIDDIR.

Github: #298