Improve overview.js to report NTP & Bucky stats; update apparmor profile re trusty kernel

This PR includes 3 main changes:

* Update Grafana overview.js to include NTP stats, since this is a cause of many of our woes.
* Update Grafana overview.js to use the Bucky Statsd graphite metrics, as collectd based statsd ones were broken in many places.
* Update the apparmor profiles to handle the trusty-lts kernel running on 12.04 LTS.