engine: Fixing update of host status during restart host

If we failed during restart a host status should be switched to NonResponsive,
the status was switched at roollback() nethod, but because of command is NonTransactive
a rollback will be never called, so moving an update of status to execute

Change-Id: I1d44a3ee76e2dc2490f8cf937a768c80826af46c
Signed-off-by: Michael Kublin <mkublin@redhat.com>