Disable puppet before running upgrade.  Enable again after.

Change-Id: Ia1fe77ed7a0ab55eae7ee2416a3ba3fcfeb10ce0
Improved outage message

Outage message that will be recorded in nagios and puppet will now be in
the format "Package Upgrade (user@host)"

Change-Id: I8c2af31416125bf6935cab583d53c3ca743c9c8f