Enable DHCP ports on neutron-dhcp-agent hosts

Conflicts:
	packstack/plugins/glance_200.py
	packstack/plugins/qpid_002.py

Change-Id: I7ed387d4ac9a397554b24c3ac318a42af7ed2901
Fixes: rhbz#999695
(cherry picked from commit 63d1b4811590112e8a4d672cbb39338a313d4c84)
Merge "Enable DHCP ports on neutron-dhcp-agent hosts" into havana