Remove quantum monitoring files for upgrades

When upgrading from quantum to neutron, the older quantum monitoring
files are not being removed and causing monitoring errors.

- Remove old quantum monitoring files

Fixes rcbops/chef-cookbooks#722

(cherry picked from commit 834d2481ddc1da6a721974b64060da696225b4ee)
Merge pull request #36 from claco/v4.2.1rc

Merged automatically by jenkins after successful build test