Improve node reassignment function
Improve node reassignment function

Wait for node to be deleted from DB before re-adding it to preserve its ID.
Use IP address to SSH to node instead of hostname.
Delete ID preservation logic from node assignment, use external function
instead.
Use proper var for node ID in logging.
Use BINDIR var for absolute path to ceph partition preservationn script.
Only run ceph partition preservation script for nodes with role 'ceph-osd'.

stackforge/fuel-octane,Mirantis/octane,stackforge/fuel-octane,Mirantis/octane