python3: Import translation layer

Python3 reorganized the standard library and moved several functions
to different modules. Six provides a consistent interface
to them through the fake six.moves module.

However, the urlparse, urllib2, etc modules have been combined
into one module which Six does not support so do it the old
fashioned way.

Change-Id: I9a865ef1fc4de6f94cc3ccf26db0483f2bdc13df
Signed-off-by: Chuck Short <chuck.short@canonical.com>
Merge "python3: Import translation layer"