Comment 5 for bug 1101142

Due to many vms are created in the host machine, performance of
 the devstack vm maybe poor.
I guess sometimes 60 seconds are not long enough to create the
icmp security group rule and the DNAT rule.

09:59:08 + timeout 60 sh -c 'while ! ping -c1 -w1 172.24.4.225; do sleep 1; done'