check the count of OSD nodes before deployment

Change-Id: Ibcf576badc8776e36295f72fe52983909a032e51
add Ceph OSD pool size storage setting

Change-Id: Ibba9e92e9936bf69de0ddcc47bc540d9c0c14b34
Merge "check the count of OSD nodes before deployment"
Merge "add Ceph OSD pool size storage setting"