Bug 9027: Perform reboot before unstable suites

Bug 9027: Perform reboot before unstable suites

It is hard to replicate Bug 9027 on Sandbox with debug logs.
The simplifierd jobs usually pass,
complete job frequently encounters a failure different from Bug 9027.
Overall that looks like an unstable test.

This change will perform hard reboot before such an unstable suite,
hoping to make the results more reliable.
At the end of the job, some suites are repeated without reboots,
so the job still tracks the unstable failures, to be debugged later.

Change-Id: Icb1681188bceafd30076555f50fac294aa4f3608
Signed-off-by: Vratko Polak <vrpolak@cisco.com>