UTAH should be more resilient if ssh isn't installed or the machine can't reboot

[Didier Roche-Tolomelli]

Some examples:
http://10.97.0.1:8080/job/ps-unity-autopilot-release-testing/label=autopilot-ati/146/console

we got a lot of
2013-03-29 08:34:54,964 dx-autopilot-ati INFO: Caught [Errno 111] Connection refused, retrying sshcheck() in 180 seconds
2013-03-29 08:37:55,048 ssh INFO: Checking for ssh availability

The machine wasn't able to reboot successfully (it was stuck on the boot screen).
To be more resilient, UTAH should:
1. check that openssh-server is installed correctly in the syslog
2. after getting a definite number of connection refused, try to reboot through kvm commands the machine
3. put the right flag in grub to avoid being stuck and have to manually enter "enter" on the grub screen because of last boot failing.

[Andy Doan (doanac)]

might be related to https://bugs.launchpad.net/utah/+bug/1162040