I think I found the problem, I used:
pcs cluster setup test_cluster --start server-2 server-1 --force
If I change this value inside corosync.conf to the actual IP, both servers are online.
ring0_addr: server-*
The hosts file looks like:
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 server-2
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.1.112 server-2
192.168.1.111 server-1
I noticed this problem with netstat. 
udp 0 127.0.0.1:5405 0.0.0.0:* 0 28920 2809/corosync