remove import urllib.parse to stay compatible with python2

[perlduck]

The "import urllib.parse" was introduced with commit 50bba2a to fix requests containing an '&' character. But the class WebApi already used urllib.parse through the use of "from six.moves import urllib". The introduction of "import urllib.parse" made the module incompatible with Python2.

[brennerm]

Thanks for the contribution and sorry for the late response.