ganglia_new: fix broken dependency

Change-Id: I867ae6bb26105fbd621a8a7d171c6c0f512b6118
ganglia: fix check-gmond-restart across distros

Ubuntu decided to fork the Ganglia package, to add an upstart script
(with "expect fork" even) and remove the SysV init (how very useful).
Doing so, they messed up and used a different pidfile location
(gmond.pid vs. ganglia-monitor.pid), so now we have two, depending on
the distribution version. Fun.

Adapt our (Varnish) check-gmond-restart script to check for either.

Change-Id: I4d3f2b2dae214d3b21984ac127ee94f57a901178