Add information about property protections to the Cloud Admin Guide

The images-api page points to this book

Closes-Bug: #1251227

Change-Id: I8bca6db4efb913f501a863114c561f8cc1df135c
author: diane fleming
neutron: admin guide cloud: updating an obsolete note on allowed address pairs

There is an obsolete note in "admin-guide-cloud" in networking introduction section
regarding neutron not allowing allowed-address-pair input that overlaps with a
fixed-ip on the same port. A recent patch to Neutron
(https://review.openstack.org/#/c/94508/2) removes this restriction.
This guide updates the note about allowed-address-pair to indicate to which
releases it applies.
Also, clean up formatting of procedures and formal para's.
Also, clean up intro text to steps and procedures.
Also, fix other odd formatting.

Change-Id: Ic89bee754a05fdb26b966b5714c729c4bc05bb50
Closes-Bug: #1327359
Update the note how to commit in the glossary

It is not necessary to fork the openstack-manuals repository
on Github.com.

Change-Id: Ia8d6759a7bf92f2c314a200c19487a95f66f888d
Merge "Add information about property protections to the Cloud Admin Guide"
Merge "neutron: admin guide cloud: updating an obsolete note on allowed address pairs"
Merge "Update the note how to commit in the glossary"