ec2api-tempest-plugin: Fix python3 Compatibility for urllib2

[yatin]

ec2api-tempest-plugin fails when ran with python3 as it relies on urllib2(it's split into urllib imports with python3[1]) Detected while testing python3 with Fedora in [2].

It fails with below Error:-
b'--- import errors ---\nFailed to import test module: ec2api_tempest_plugin.scenario.test_vpn\nTraceback (most recent call last):\n File "/usr/lib/python3.6/site-packages/unittest2/loader.py", line 456, in _find_test_path\n module = self._get_module_from_name(name)\n File "/usr/lib/python3.6/site-packages/unittest2/loader.py", line 395, in _get_module_from_name\n __import__(name)\n File "/usr/lib/python3.6/site-packages/ec2api_tempest_plugin/scenario/test_vpn.py", line 20, in <module>\n import urllib2\nModuleNotFoundError: No module named \'urllib2\'\n'

ec2api-tempest-plugin needs to be fixed to support python3.

[1] https://docs.python.org/2/library/urllib2.html
[2] https://review.openstack.org/#/c/625613/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/627403

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/627403
Committed: https://git.openstack.org/cgit/openstack/ec2api-tempest-plugin/commit/?id=42bce570cac2a9ff12352701f8e32d5d49112be4
Submitter: Zuul
Branch: master

commit 42bce570cac2a9ff12352701f8e32d5d49112be4
Author: yatin <email address hidden>
Date: Wed Dec 26 17:58:00 2018 +0530

    Fix python3 Compatibility for urllib2

    The urllib2 module has been split across several modules
    in Python 3 named urllib.request and urllib.error [1].

    This patch makes code compatible for both python2 and
    python3 by using six.moves.urllib [2].

    [1] https://docs.python.org/2/library/urllib2.html
    [2] https://pythonhosted.org/six/

    Change-Id: Ie9ebe0d1e39ddb4704df067d42915204e49821cf
    Closes-Bug: #1809801

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/ec2api-tempest-plugin 0.2.0 release.