Fixed service restarting

[fmancinelli]

The previous code didn't restart correctly glance (package name is different from service name) and nova-compute (because at the end of the installation it isn't running)

Now service names are taken directly from /etc/init.d and if a service fails to restart, we try to actually start it.

[uksysadmin]

Yeah - happy at that. I added in Glance without adding in further thought in the script to pick up the new packages.