Refactor rolebook to use upstream cookbooks

**THIS DEPENDS ON A PULL REQUEST TO RACKSPACE_CLOUDMONITORING**
https://github.com/rackspace-cookbooks/rackspace_cloudmonitoring/pull/37

- Bumps cookbook version
- Pins to later versions of upstream cookbooks
- Brings in NTP, MOTD, and rack_user as wrapper recipes depending on upstream cookbooks
- Will serve as a "base" role