Applies neutron-conductor service on OpenStack Havana

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Tested on CentOS 6.4 with ML2 plugin with OVS driver.

Environment:
Linux devstack-centos64 2.6.32-358.123.2.openstack.el6.x86_64 #1 SMP
Thu Sep 26 17:14:58 EDT 2013 x86_64 x86_64 x86_64 GNU/Linux

Used localrc for testing:
https://gist.github.com/zyluo/9503014

*IMPORTANT*
If you have your own localrc file, be sure you have "enable_service neutron"
added into it. Also note that the conductor service has only been tested
with the ML2 plugin with the OVS driver.

Neutron conductor branch:
(This branch will be automatically pulled to /opt/stack/neutron)
https://github.com/zyluo/neutron/tree/havana_conductor_sg_only