Switch all uses of urlparse to import from six

As part of enabling python3 support in tempest we need to be able to
handle urlparse usage in both python2 and python3. Six provies a compat
layer for doing this, so this commit moves all uses of urllparse to
get it through six.

Change-Id: Ic9c15d90fd3b8413fec4d01a070cc167f7536e62
12 files changed