Code review comment for lp:~brad-marshall/charms/trusty/nova-cloud-controller/add-nrpe-checks

Thank for the mp. The new nrpe support is very gratefully received !

I've taken this branch and centralised the common code between this and the other nrpe branches and moved it to charm-helpers. To land it I created a new branch from this one which has now been merged into the 'next' charm. The 'next' charms will overwrite the stable ones in a couple of weeks.