Add ganglia graph for global jobqueue length

Stolen from the check for en.wiki running on spence, but on hume
to avoid relying on spence having a MediaWiki install.
totalonly added in I0d09961cee333f5c36848277ffa02565fb406efb
Using mwdeploy and ensure present per ^demon.
While rebasing, restored the jobqueue check for en.wiki but in
icinga.pp and running on hume too (was spence), per Leslie.

Change-Id: I4b67f60a62a370ea327f7fa68eea9ca444baa3bc