Fixed adding/removing nodes

- Added ability to use rrp nodes with a ','
- Changed to use a corosync reload after adding/removing nodes
Added ability to add/remove nodes from GUI

- Fixed issue with remove anything other than the last node with pcs
- Changed some cibadmin commands to use '-l' for local access
- When adding a node to corosync.conf we use the first available node id
  (instead of 1 + the highest node id)