Recognize 'bootstrap' status like not booted

We change algorithm which detect node status
for provision operation. But if some of node
do no rebooted (see https://bugs.launchpad.net/fuel/+bug/1318567
for details). Without this fix we will recognize
such nodes as bootstraped instead of not booted.

Change-Id: I285ed61231452473b21f7cf8739a19248efa00b9
Related-Bug: #1377105