move xmlrpc marshaller into lib and use i8 for large ints

devtools/fakehub

@@ -7,7 +7,6 @@ import os
 import os.path
 import pprint
 import sys
-import six.moves.xmlrpc_client
 from six.moves import cStringIO
 from six.moves.urllib.parse import quote
 
@@ -58,7 +57,7 @@ def get_request():
         else:
             args.append(nice_literal(s))
     args = koji.encode_args(*args, **kwargs)
-    request = six.moves.xmlrpc_client.dumps(args, method, allow_none=1)
+    request = koji.dumps(args, method, allow_none=1)
     return request
 
 
@@ -68,7 +67,7 @@ def start_response(status, headers):
 
 
 def parse_response(data):
-    p, u = six.moves.xmlrpc_client.getparser()
+    p, u = koji.getparser()
     for chunk in data:
         p.feed(chunk)
     p.close()