Added Fibre Channel Zone Driver content in Configuration Reference Guide

Added new content https://review.openstack.org/#/c/138792/ into stable/Juno

Change-Id: Id250ec415c67a374f404294cfa25a17e2bbcf1fb
backport: none
Closes-Bug: #1399021
Merge "Added Fibre Channel Zone Driver content in Configuration Reference Guide" into stable/juno