INSTALL: add additional dependencies
INSTALL: add additional dependencies

These dependencies are required to build on Ubuntu.
rackerlabs/openstack-guest-agents-unix,rackerlabs/openstack-guest-agents-unix,rackerlabs/openstack-guest-agents-unix,joejulian/openstack-guest-agents-unix,joejulian/openstack-guest-agents-unix,joejulian/openstack-guest-agents-unix