Restrict mongodb listening to admin network

Less exposure to potential security issues.
Start Ceilometer services directly
Add README file
Add correct hostname for compute servers list
Add tests for some VM meters
Checking if libvirt_type exists
Update 00-deploy-ceilometer.test
Merge pull request #15 from dirkmueller/release/pebbles/master

Restrict mongodb listening to admin network
Merge pull request #18 from MirantisDellCrowbar/bug/DCB-158/pebbles/master

Add README, libvirt_type on a compute node
Merge pull request #19 from dirkmueller/start_ceilometer

Start ceilometer