create_websocket needs support for IPv6

[Dr. Jens Harbott]

When the novnc endpoint contains an IPv6 address or an hostname that points to one, tempest.api.compute.servers.test_novnc.NoVNCConsoleTestJSON.test_novnc fails because create_websocket() is hardcoded to create a socket with AF_INET only, while one would need AF_INET6 in that case.

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "tempest/api/compute/servers/test_novnc.py", line 168, in test_novnc
        self._websocket = compute.create_websocket(body['url'])
      File "tempest/common/compute.py", line 298, in create_websocket
        client_socket.connect((url.hostname, url.port))
      File "/usr/lib/python2.7/socket.py", line 228, in meth
        return getattr(self._sock,name)(*args)
    socket.gaierror: [Errno -9] Address family for hostname not supported

This is related to https://launchpad.net/bugs/1656329

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/507823

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/507823
Committed: https://git.openstack.org/cgit/openstack/tempest/commit/?id=6bc422d2eb0a6b76aee479b08ed8b033938fd3d2
Submitter: Zuul
Branch: master

commit 6bc422d2eb0a6b76aee479b08ed8b033938fd3d2
Author: Jens Harbott <email address hidden>
Date: Wed Sep 27 10:29:34 2017 +0000

    Add IPv6 support to create_websocket()

    The current implementation is hardcoded to use AF_INET, which means
    IPv4. We need to be able to support IPv6 connections, too, so we use the
    socket.getaddrinfo() function as described in [1] in order to provide a
    more generic solution.

    [1] https://docs.python.org/2/library/socket.html

    Change-Id: I2ccbe3b25e79031a3c961871034c0c1b94d7ee80
    Closes-Bug: 1719575
    Related-Bug: 1656329

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tempest 18.0.0 release.