Inconsistency description of "br-ext"

[Dongfeng Huang]

In the document networking-prerequisites.rst, the description of "br-etx" should be "br-ext". It occurred only in one place.

The document link is:
https://github.com/openstack/tricircle/blob/master/doc/source/networking-prerequisites.rst

The error location is:
Using following command to connect the bridge to physical ethernet interface, as shown below, "br-vlan" is wired to eth1, and "br-etx" to eth2.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/422431

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/422431
Committed: https://git.openstack.org/cgit/openstack/tricircle/commit/?id=a55fee6e31704b995916faed0c8274ead8d3b8b8
Submitter: Jenkins
Branch: master

commit a55fee6e31704b995916faed0c8274ead8d3b8b8
Author: Dongfeng Huang <email address hidden>
Date: Thu Jan 19 15:30:03 2017 +0800

    "br-etx" should be "br-ext" in the doc

    1. What is the problem?
    In the document networking-prerequisites.rst, the "br-ext" is
    written as "br-etx". It should be "br-ext".

    2. What is the solution to the problem?
    Change the description of "br-etx" to "br-ext".

    3. What the features need to be implemented to the Tricircle to realize
    the solution?
    No new features.

    Change-Id: I57c3f55f1ed07a6328a1af96459364df224551b8
    Closes-Bug: #1657637

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tricircle 3.0.0 release.