Change devstac plugin name from nec-openflow to nec
Add VNC config to localrc for compute host
Rename quantum to neutron
Update localrc

- Enable heat and ceilometer by default
- Make q-lbaas default
- Add q-vpn and related configurations to test back-to-back VPNaaS
- Change the default password to simpler one
Disable Ceilometer and Heat by default

Ceilometer uses Mongo DB and DB size is too big for 8GB VM :-(
Heat requires Heat template by file or URL, so I need to investigate
some more....
Remove VM images in devstack-cleaner.sh
deploy-devstack: Exec git pull when devstack dir exists
Use openstack default repos by default
deploy-devstack: Copy sample localrc when devstack dir exists
Add PostgreSQL config to localrc

PostgreSQL is disabled by default.
Add stub ofc_driver to localrc