An instance doesn't get an IP after deployment

Description of problem
=======================
After deployment when launching an instance - it doesn't get an IP.
When launching a second instance on the same node - it gets and IP.
Then when rebooting the first one - it gets an IP

Version
=======
opendaylight-6.1.0-2.el7ost.noarch

Steps to Reproduce
=====================
1.Deploy an overcloud
2.Launch an instance.
3.Open The proper security group rules
4.Verify that it doesn't get an IP (can be pinged from the DHCP name space).
5.Launch an instance on the same node as the first one and make sure it gets an IP.