Change xmlrpclib importing way

Signed-off-by: Valerij Maljulin <vmaljuli@redhat.com>

module_build_service/builder/KojiModuleBuilder.py

@@ -35,11 +35,7 @@ import random
 import string
 import kobo.rpmlib
 import threading
-try:
-    import xmlrpclib
-except ImportError:
-    import xmlrpc.client as xmlrpclib
-
+import six.moves.xmlrpc_client as xmlrpclib
 import munch
 from itertools import chain
 from OpenSSL.SSL import SysCallError

module_build_service/scheduler/handlers/modules.py

@@ -41,11 +41,7 @@ from requests.exceptions import ConnectionError
 from module_build_service.utils import to_text_type
 
 import koji
-try:
-    import xmlrpclib
-except ImportError:
-    import xmlrpc.client as xmlrpclib
-
+import six.moves.xmlrpc_client as xmlrpclib
 import logging
 import os
 import time

tests/test_builder/test_koji.py

@@ -26,10 +26,7 @@ import tempfile
 import mock
 import koji
 
-try:
-    import xmlrpclib
-except ImportError:
-    import xmlrpc.client as xmlrpclib
+import six.moves.xmlrpc_client as xmlrpclib
 from collections import OrderedDict
 from module_build_service.utils import to_text_type