Remove dnsmasq.template file from Configuring Multiple Cluster Networks doc

[Aleksandr Didenko]

Here's the problem doc:
https://docs.mirantis.com/openstack/fuel/fuel-7.0/operations.html#mcn-ops

The process of DHCP ranges configuration has been changed here https://bugs.launchpad.net/fuel/+bug/1473483, so in 7.0 editing of dnsmasq.template file is not needed and moreover such changes won't survive cobbler container restart.

So we need to update doc and replace:

1. Add each DHCP network into the dnsmasq.template file.

With something like this:

===== START =====
1. Add each DHCP network into /etc/fuel/astute.yaml file as a new element of EXTRA_ADMIN_NETWORKS hash, like this:
EXTRA_ADMIN_NETWORKS:
  extra_net_144:
    dhcp_gateway: "10.144.0.5"
    dhcp_pool_end: "10.144.0.254"
    dhcp_pool_start: "10.144.0.10"
    ipaddress: "10.145.0.2"
    netmask: "255.255.255.0"
  extra_net_146:
    dhcp_gateway: "10.146.0.5"
    dhcp_pool_end: "10.146.0.254"
    dhcp_pool_start: "10.146.0.10"
    ipaddress: "10.145.0.2"
    netmask: "255.255.255.0"

And restart cobbler container with "dockerctl restart cobbler" command.
===== END =====

We can also remove any references to dnsmasq.template file in Fuel-7.0 documentation.

[Fuel Devops McRobotson (fuel-devops-robot)]

Fix proposed to branch: stable/7.0
Change author: Alexander Adamov <email address hidden>
Review: https://review.fuel-infra.org/17897

[Fuel Devops McRobotson (fuel-devops-robot)]

Reviewed: https://review.fuel-infra.org/17897
Submitter: Olga Gusarenko <email address hidden>
Branch: stable/7.0

Commit: c249507bc6d46be4a40909239df9c68feb352628
Author: Alexander Adamov <email address hidden>
Date: Thu Mar 10 11:12:03 2016

[Docs 7.0] Remove dnsmasq.template file

Removed from:
- 'Configuring Multiple Cluster Networks'
  in Operations Guide
- 'Implementing Multiple Cluster Networks'
  in Reference Architecture

Change-Id: Iff3befc4b78ce6e2782bdfe14781d4ee0b942a20
Closes-Bug: #1519746