Updates and re-organization of cloud provider based network and user management.
	modified:   rtwo/accounts/openstack.py
	renamed:    rtwo/drivers/eucalyptusUserManager.py -> rtwo/drivers/eucalyptus_user.py
	modified:   rtwo/drivers/openstack.py
	renamed:    rtwo/drivers/openstackNetworkManager.py -> rtwo/drivers/openstack_network.py
	renamed:    rtwo/drivers/openstackUserManager.py -> rtwo/drivers/openstack_user.py
	deleted:    rtwo/drivers/virtualboxExportManager.py
	modified:   rtwo/settings.py
	modified:   rtwo/test_settings.py.dist