Python3 pylint fixes

Sprinkle 'pylint disable' comments over the code base to silence a bunch
of pylint warnings on Python 3. All silenced warnings are harmless and
not bugs.

https://fedorahosted.org/freeipa/ticket/4985

Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Martin Basti <mbasti@redhat.com>

ipalib/rpc.py

@@ -623,7 +623,9 @@ class KerbTransport(SSLTransport):
 
             while True:
                 if six.PY2:
+                    # pylint: disable=no-value-for-parameter
                     self.send_request(h, handler, request_body)
+                    # pylint: enable=no-value-for-parameter
                     self.send_host(h, host)
                     self.send_user_agent(h)
                     self.send_content(h, request_body)