Fixes to the compute node to enable SSH to VMs

* Some nova.conf changes - vncserver_listen=0.0.0.0, public_interface=eth0
* Some api-paste.ini additions - auth_port = 35357, auth_protocol = http
* No canonical callout on guestfs, launchpad doesn't show it as their call
* Adds security groups so you can ssh into launched instances
* Whitespace fixes

Closes-bug: 1240443

Change-Id: Ib9b2112aa54a207d17e613506233343e5ebd95b9
Merge "Fixes to the compute node to enable SSH to VMs"