Update sample_data.sh to match docs

I uploaded a draft here:
https://gist.github.com/0xffea/4979826

Fix proposed to branch: master
Review: https://review.openstack.org/22237

Reviewed: https://review.openstack.org/22237
Committed: http://github.com/openstack/keystone/commit/d6f7cbc484868bdec3eeb9d4b0f45b10ce536e79
Submitter: Jenkins
Branch: master

commit d6f7cbc484868bdec3eeb9d4b0f45b10ce536e79
Author: David Höppner <email address hidden>
Date: Mon Feb 18 19:07:36 2013 +0100

    Update sample_data.sh to match docs

    Confirm more with the "OpenStack Install and Deploy Manual."

    Change-Id: I46ab7e8e5ccdf389cbc60fee84c063f289155781
    Fixes: bug #1073291

Fix proposed to branch: master
Review: https://review.openstack.org/23128

Fix proposed to branch: master
Review: https://review.openstack.org/27653

Reviewed: https://review.openstack.org/27653
Committed: http://github.com/openstack/keystone/commit/76ee689d09de6c93de447ade626c94137c778865
Submitter: Jenkins
Branch: master

commit 76ee689d09de6c93de447ade626c94137c778865
Author: Robert H. Hyerle <email address hidden>
Date: Sun Apr 28 19:04:24 2013 +0200

    Accept env variables to override default passwords

    Preserves the default passwords corresponding to the OpenStack Install
    and Deploy Manual while allowing environment variables to specify user
    provided passwords. As well, a single common password for all the service
    users can be specified using the SERVICE_PASSWORD environment variable.

    This fix restores compatibility with the version of this script released
    in Folsom where the environment variables could override default passwords.
    It also preserves compatibility with the fix for bug 1073291 that brought
    the script into line with the docs (but unfortunately broke backwards
    compatibility).

    There is no warning emited if the user does not override the default
    passwords as was present in Folsom, but not in Grizzly. This makes the
    fix output compatible with Grizzly only. Note that the logic for warnings
    pre-Grizzly was unclear. The script is, however, clearly named "sample"
    and warnings are present in the comments.

    Change-Id: I927fcddf04dcb87e5c9252f0874939b17f3c4809
    Fixes: bug #1166182

Fix proposed to branch: stable/grizzly
Review: https://review.openstack.org/29950

Reviewed: https://review.openstack.org/29950
Committed: http://github.com/openstack/keystone/commit/6090bbe7a0ca98be9e8a56c3a655cfc496b2926f
Submitter: Jenkins
Branch: stable/grizzly

commit 6090bbe7a0ca98be9e8a56c3a655cfc496b2926f
Author: Robert H. Hyerle <email address hidden>
Date: Sun Apr 28 19:04:24 2013 +0200

    Accept env variables to override default passwords

    Preserves the default passwords corresponding to the OpenStack Install
    and Deploy Manual while allowing environment variables to specify user
    provided passwords. As well, a single common password for all the service
    users can be specified using the SERVICE_PASSWORD environment variable.

    This fix restores compatibility with the version of this script released
    in Folsom where the environment variables could override default passwords.
    It also preserves compatibility with the fix for bug 1073291 that brought
    the script into line with the docs (but unfortunately broke backwards
    compatibility).

    There is no warning emited if the user does not override the default
    passwords as was present in Folsom, but not in Grizzly. This makes the
    fix output compatible with Grizzly only. Note that the logic for warnings
    pre-Grizzly was unclear. The script is, however, clearly named "sample"
    and warnings are present in the comments.

    Change-Id: I927fcddf04dcb87e5c9252f0874939b17f3c4809
    Fixes: bug #1166182