Add minor adjustment to mig.shared.base that I missed in my PR61 merge because it was only visible in the original round of commits on github, sorry.

git-svn-id: svn+ssh://svn.code.sf.net/p/migrid/code/trunk@6056 b75ad72c-e7d7-11dd-a971-7dbc132099af

Author: jonasbardino

mig/shared/base.py

@@ -29,6 +29,7 @@
 
 from __future__ import print_function
 from __future__ import absolute_import
+from past.builtins import basestring
 
 import base64
 import os