Make method _console() public

[huangtianhua]

Now heat calls the individual methods to retrieve a console of a particular protocol, see https://github.com/openstack/heat/blob/master/heat/engine/clients/os/nova.py#L584-L617
it is not good in maintainability, so heat wants to use 'novaclient.v2.servers.ServerManager._console' method to simplify the implementation of retrieving server console. It's better to change this method to public for public use.
Also openstackclient can use the new unified interface to get console urls for server.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/414364

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/414364
Committed: https://git.openstack.org/cgit/openstack/python-novaclient/commit/?id=2512a28dc1f9a017b996c648ecd2551162ef1fc3
Submitter: Jenkins
Branch: master

commit 2512a28dc1f9a017b996c648ecd2551162ef1fc3
Author: huangtianhua <email address hidden>
Date: Thu Dec 22 10:31:29 2016 +0800

    Make _console() public

    Heat wants to use 'novaclient.v2.servers.
    ServerManager._console' method to simplify the
    implementation of retrieving server console.
    It's better to change the method to public for
    public use.
    The patch changes:
    1. add public method named get_console_url() for class
       'novaclient.v2.servers.Server'
    2. rename _console() to get_console_url() for class
       'novaclient.v2.servers.ServerManager'

    Change-Id: I3d1485468d1d0a79d4002981ebe05b6cdf2332e7
    Closes-Bug: #1651677

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/python-novaclient 7.1.0 release.