Added complete Doc Conventions in Install Guide.

backport: havana

Change-Id: Icd74a1a4db8ec477e48d49475c405d3b09e52c1c
Partial-Bug: #1121866
(cherry picked from commit 3973d7eecbce631dd7652c7aca362a48e15cea93)
Move create network section to the bottom

Locate Create the base Neutron networks section after the sections
involving installation of Neutron on the network, controller, and
compute nodes, which makes the order more sense.

Change-Id: I9229324c2f9eac6a324f51e7d3dd853f17199fab
backport: havana
Closes-Bug: #1252334
(cherry picked from commit d0ce7524fd19993659b88df84b5ebcab46f65a52)
Merge "Move create network section to the bottom" into stable/havana
Merge "Added complete Doc Conventions in Install Guide." into stable/havana