When all node-roles are active, make the snapshot active [1/2]

This pull is the last yard, when you set a node-role to active
it will check to see if all the other node-roles in the snapshot are active.

If so, it will activate the snapshot.


 crowbar_framework/app/models/node_role.rb |    7 +++++++
 1 file changed, 7 insertions(+)

Crowbar-Pull-ID: 297efb9d2eccac3982d6e3a1f8c7ea7fe0d4ec68

Crowbar-Release: development