clear claimed nodes (chef data) on node reset

Conflicts:

	crowbar_framework/app/models/provisioner_service.rb
Merge pull request #210 from jjacob512/pull-req-release-roxy-master-9e6df227c057867110afd0b49f9e77a11d92108e

merging batch of fixes from mesa-1.6 to roxy [3/3]
Add in LVM metadata zapping, and make walk_node_through more panicky.

Conflicts:

	updates/control.sh
Merge pull request #213 from jjacob512/pull-req-release-roxy-master-9497171628e5600d90e6aad8860dfa4ab3bcb40f

Merge LVM zapping fix from mesa to roxy [1/1]