Use six.moves.http_client instead of httplib

The module was renamed in Python 3.

Reviewed-By: David Kupka <dkupka@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>
Reviewed-By: Martin Basti <mbasti@redhat.com>

ipapython/nsslib.py

@@ -21,7 +21,6 @@
 from __future__ import print_function
 
 import sys
-import httplib
 import getpass
 import socket
 from ipapython.ipa_log_manager import *
@@ -31,6 +30,14 @@ import nss.io as io
 import nss.nss as nss
 import nss.ssl as ssl
 import nss.error as error
+
+# Python 3 rename. The package is available in "six.moves.http_client", but
+# pylint cannot handle classes from that alias
+try:
+    import httplib
+except ImportError:
+    import http.client as httplib
+
 from ipaplatform.paths import paths
 
 # NSS database currently open
@@ -295,6 +302,7 @@ class NSSConnection(httplib.HTTPConnection, NSSAddressFamilyFallback):
             self.close()
             raise e
 
+
 class NSSHTTPS(httplib.HTTP):
     # We would like to use HTTP 1.1 not the older HTTP 1.0 but xmlrpc.client
     # and httplib do not play well together. httplib when the protocol