openstack-full: mongodb from 10gen (Closes: #29)

  Fix openstack-full build on ubuntu
  refs: d3691d7cd8550341b298670bb4d354fad5997a94
  we use mongodb from 10gen as requested by some of our Puppet modules.
openstack-full: Update neutron packages

  Switch to neutron (s/quantum/neutron)
  Fix l3/vpn agent confilcts (remove neutron-plugin-vpn-agent)

  neutron-l3-agent : Conflicts: neutron-vpn-agent
  neutron-vpn-agent : Conflicts: neutron-l3-agent
build/makefile: Switch to Havana !

  Update default value for PVER: Folsom (F) → Havana (H)