Wrong bootstrap admin url

[Yaro Kifor]

This bug tracker is for errors with the documentation, use the following as a template and remove or add fields as you see fit. Convert [ ] into [x] to check boxes:

- [x] This doc is inaccurate in this way: The bootstrap admin-url should be http://controller:35357/v3/ and not http://controller:5000/v3/
- [ ] This is a doc addition request.
- [ ] I have a fix to the document that I can paste below including example: input and output.

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-----------------------------------
Release: 13.0.0.0rc2.dev68 on 2018-03-11 02:56
SHA: 190eab2e04b8890b22ed376b5bee71b3623505d9
Source: https://git.openstack.org/cgit/openstack/keystone/tree/doc/source/install/keystone-install-ubuntu.rst
URL: https://docs.openstack.org/keystone/latest/install/keystone-install-ubuntu.html

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/553799

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/553799
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=1b01ebce5632bbde162937b41b02177168d00ec2
Submitter: Zuul
Branch: master

commit 1b01ebce5632bbde162937b41b02177168d00ec2
Author: Colleen Murphy <email address hidden>
Date: Fri Mar 16 15:21:40 2018 +0100

    Add note to keystone-manage bootstrap doc

    A lot of people are very surprised that we no longer reference port
    35357 in our Ubuntu (and SUSE) install guides. Add a note to clarify
    that this is not a bug and we do really mean it.

    This does not change the RDO install guide because our guide still
    instructs users to use port 35357 because the RDO package still includes
    an Apache vhost file that uses 35357.

    Change-Id: I334ba888190705a345d50cebe577b832753f202c
    Related-bug: #1755026
    Related-bug: #1755511
    Related-bug: #1756178