Updated openstack/openstack
Project: openstack-infra/devstack-gate  3f3f9208bd6c2cec0e241c0e2ee161194ebc0179
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Run stack.sh with forced line buffering

Sometimes when stack.sh has an error we don't get all of the console log.
This is part of a set of patches to attempt to eliminate console output
buffering so Jenkins has an opportunity to get all of the output.
The other change is in https://review.openstack.org/#/c/71996/ that
eliminates the buffering that tee(1) does.

If this works and is not too harmful to run times we'll come back and
to the same thing to the grenade.sh execution.

Change-Id: I7f567c43c966fcfd822715ec0baa53755af6099a