Decide operation logic when node information updated on ceph cluster yaml

[hbinkim]

When cephCluster.yaml updated with node information, there are some things to consider on implementation,

• add logic to disallow the removal of the bootstrapped node and pre-existing osd hosts (not implemented yet)
• bootstrapped node and pre-existing osd node remains (current implementation)
• newly added node as treated as new osd nodes (current implementation)
• a new ceph cluster is bootstrapped and osd yaml is applied (X)
  • however, the existing bootstrapped node and that ceph cluster should be deleted (this needs to be implemented)