ceph.conf: prolong "mon mgr mkfs grace" to 2 minutes
it might take longer than 1 minutes to:
1. create a monmap
2. create the auth keyrings
3. prepare the osd devices and activate OSDs (fdisk,mkfs.xfs,ceph-osd --mkfs)
4. prepare the monitors (mkfs), and start them
5. start monitor
debug paxos = 20
debug auth = 20
mon data avail warn = 5
+ mon mgr mkfs grace = 120
mon reweight min pgs per osd = 4
mon osd reporter subtree level = osd
mon osd prime pg temp = true
