Remove support for old Swift memcache interface.

Since this has  been removed since a year, it's time to clean this up.

Change-Id: I6681a31f675f2178285dadea876af1fdb7a8a4c3
Python3: use six.moves.urllib.parse.quote instead of urllib.quote

This makes the code compatible with both python 2 and 3.

Change-Id: Ic1c5c8d4a85db138a8402ea4b3208828fc118a40
Remove tox locale overrides

* tox.ini: The LANG, LANGUAGE and LC_ALL environment overrides were
introduced originally during the testr migration in an attempt to be
conservative about the possibility that locale settings in the
calling environment could cause consistency problems for test runs.
In actuality, this should be unnecessary and any place where it does
cause issues ought to be considered an actual bug. Also, having
these in the configuration actively causes older pip to have
problems with non-ASCII content in some package metadata files under
Python 3, so drop it now.

Change-Id: I96581dced7eac202d6715837037bb1c002550a14
Closes-Bug: #1277495
Make sure to unset all variable starting with OS_

Some OS_ variables are conflicting with the tests, make sure to unset
them before starting the CLI tests.

Change-Id: Ie4ef467571137a685976d36026866889f7a2a1a8
Closes-Bug: 1278144
Merge "Remove tox locale overrides"
Merge "Remove support for old Swift memcache interface."
Merge "Make sure to unset all variable starting with OS_"
Merge "Python3: use six.moves.urllib.parse.quote instead of urllib.quote"