Add quotes to image name so names with spaces don't break it.

Currently you get errors like:
err: /Stage[deploy]/Mcloud::Openstack::Glance::Images/Glance_image[64bit Ubuntu 12.04]/ensure: change from absent to present failed: Execution of '/usr/bin/glance -T services -I glance -K ******* -N http://127.0.0.1:35357/v2.0/ add name=64Bit Ubuntu 12.04 is_public=Yes container_format=ovf disk_format=qcow2 copy_from=http://********/UEC/20121224/precise-server-cloudimg-amd64-disk1.img' returned 1: Error communicating with http://***********:9292 [Errno 111] Connection refused