Fix deprecation warnings for cgi.parse_qs() and cgi.parse_qsl()

supervisor/tests/test_web.py::UIHandlerTests::test_handle_request_tail_html
  /home/travis/build/Supervisor/supervisor/supervisor/web.py:623: PendingDeprecationWarning: cgi.parse_qs is deprecated, use urlparse.parse_qs instead
    query_data = parse_qs(query)

supervisor/tests/test_web.py::UIHandlerTests::test_handle_request_tail_html
  /home/travis/build/Supervisor/supervisor/supervisor/web.py:622: PendingDeprecationWarning: cgi.parse_qsl is deprecated, use urlparse.parse_qsl instead
    form_urlencoded = parse_qsl(data)

Author: mnaberez

supervisor/compat.py

@@ -76,11 +76,6 @@ def is_text_stream(stream):
 except ImportError: # pragma: no cover
     from sys import maxsize as maxint
 
-try: # pragma: no cover
-    from urllib.parse import parse_qs, parse_qsl
-except ImportError: # pragma: no cover
-    from cgi import parse_qs, parse_qsl
-
 try: # pragma: no cover
     import http.client as httplib
 except ImportError: # pragma: no cover

supervisor/web.py

@@ -7,8 +7,7 @@
 import meld3
 
 from supervisor.compat import urllib
-from supervisor.compat import parse_qs
-from supervisor.compat import parse_qsl
+from supervisor.compat import urlparse
 from supervisor.compat import as_string
 from supervisor.compat import PY2
 from supervisor.compat import unicode
@@ -619,8 +618,8 @@ def continue_request (self, data, request):
         query = form['QUERY_STRING']
 
         # we only handle x-www-form-urlencoded values from POSTs
-        form_urlencoded = parse_qsl(data)
-        query_data = parse_qs(query)
+        form_urlencoded = urlparse.parse_qsl(data)
+        query_data = urlparse.parse_qs(query)
 
         for k, v in query_data.items():
             # ignore dupes