Install Guide: Add link to proper chapter

Link to networking chapter of the Config Guide, not to the table
of contents.

Change-Id: I65db7709809a5269da248fdebb298df9fd3d838a
backport: havana
Closes-Bug: #1253514
(cherry picked from commit c1cd94f62b5acc73c41cba17a1af2acdd027fe55)
Message bus additions for RHEL/CentOS/Fedora distributions

Added the default 'qpid' implementation details for neutron.conf as this was omitted and reported upstream.

Change-Id: I527751f8380dd1883fb9f1159089f7050130fc74
Closes-bug: #1258292
(cherry picked from commit 28975b3c0913be3d35766d5293839e327be748db)
Merge "Message bus additions for RHEL/CentOS/Fedora distributions" into stable/havana
Merge "Install Guide: Add link to proper chapter" into stable/havana