Install and configure a storage node in cinder

- [ ] This doc is inaccurate in this way: ______
- [ ] This is a doc addition request.
- [X] I have a fix to the document that I can paste below including example: input and output.

The page says:
auth_url = http://controller:35357

It should say:
auth_url = http://controller:5000

I tested it and it is consistent with the rest of the documentations.

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Release: 12.0.4.dev36 on 2018-08-21 05:11
SHA: 448ad106d34bfcc3440953bacd3db96a7c2ae3f7
Source: https://git.openstack.org/cgit/openstack/cinder/tree/doc/source/install/cinder-storage-install-ubuntu.rst
URL: https://docs.openstack.org/cinder/queens/install/cinder-storage-install-ubuntu.html