Feature #1639: Allow a VM to be migrated from the unknown state

(cherry picked from commit 9ace10e010e74f61b139c96d60b5482cb68cae1e)
(cherry picked from commit 78ea7034a3280a3411efdc64b00dcccb357cdc3e)
Feature #1639: fault tolerance hook rescheds VMs from unknown

(cherry picked from commit c5f0bc26366e93f528060b825ac4b8507cf6aef3)
(cherry picked from commit 674bacc122f61ea392e7420a83a0c2770630be16)
Feature #1639: Change fault tolerance default options

(cherry picked from commit 908ef5f499a674019772b4a6fee17ef0c507e896)
(cherry picked from commit 03af607c7ded4abe9c51ffd07a285aab753e9bdb)
feature #1639: UNKNOWN VMs migrate to BOOT state. Live migrations only for RUNNING VMs

(cherry picked from commit c794a0f62f47dcb1da4639e7a47757ffc426d5c4)
feature #1639: Typo
feature #1639:  The scheduler now rescheds VMs in unknown
feature #1639: Fix compilation issues