Actually, after looking into logs I can't see evidence that "Cluster was not assembled in time timeout=600" is true.
Pacemaker begun stopping slaves at '2016-01-29T01:48:33.101797+00:00' and all nodes were up after '2016-01-29T01:50:52.504074+00:00' - it's definitely less than 600 seconds.
Actually, after looking into logs I can't see evidence that "Cluster was not assembled in time timeout=600" is true.
Pacemaker begun stopping slaves at '2016-01- 29T01:48: 33.101797+ 00:00' and all nodes were up after '2016-01- 29T01:50: 52.504074+ 00:00' - it's definitely less than 600 seconds.