Correct the msg ipv6 enable in system
Correct the msg ipv6 enable in system

net.ipv6.conf.default.disable_ipv6 = 1 means disable ipv6.
We should correct it in the same with code logic.

Change-Id: I6be6a9759878667d145cdd49de6cc10b7822957f

mahak/neutron,eayunstack/neutron,huntxu/neutron,noironetworks/neutron,eayunstack/neutron,noironetworks/neutron,mahak/neutron,mahak/neutron,openstack/neutron,huntxu/neutron,openstack/neutron,openstack/neutron