Comment 4 for bug 1572082

Reviewed: https://review.openstack.org/309107
Committed: https://git.openstack.org/cgit/openstack/kolla/commit/?id=fc6b00ba6931f658d5e1b6831384d1b69d9b72a7
Submitter: Jenkins
Branch: stable/mitaka

commit fc6b00ba6931f658d5e1b6831384d1b69d9b72a7
Author: Paul Bourke <email address hidden>
Date: Tue Apr 19 15:59:51 2016 +0100

    Disable tty for keystone register script

    There seems to be a bug regarding the interaction between the Red Hat
    based images and docker exec, where output is missed when attaching a
    tty. This can be replicated using the following:

    $ docker run -d --name test centos /bin/sleep infinity
    $ docker exec -t test echo hi

    Repeat the second command over and over, "hi" will only be printed out
    every couple of runs.

    This affects the keystone register task as sometimes it will not print
    it's final json result to stdout, causing ansible to fall over with a
    difficult to diagnose error (despite the register having run
    successfully).

    Disabling the tty fixes this for me, it should not be needed in this
    case regardless.

    Change-Id: Ie7eb7c01c34ee3c59bd843651195fbcb7259d2c8
    Closes-Bug: #1572082
    (cherry picked from commit e2452906f3389e0ae2fa704ee4ce431e1c9f832b)