Merge pull request #286 from jcannava/sprint

adding nova-network submodule
Auto Updating nova-network submodule
Auto Updating corosync submodule
Auto Updating nova submodule
Auto Updating nova-network submodule
Auto Updating apache2 submodule
Auto Updating xfs submodule
Auto Updating apt submodule
Auto Updating build-essential submodule
Auto Updating collectd submodule
Auto Updating mysql-openstack submodule
Auto Updating mysql submodule
adding roles for network management. they call a recipe (based on type) inside of nova-network that checks network provider information etc..
updating single-compute and single-controller roles to include new network roles