Fix io_utils for doctest

HySoP/hysop/tools/io_utils.py

@@ -52,7 +52,7 @@ class io(object):
         else:
             # -- python --
             a = a[-1]
-            if a[-1] is None:
+            if a[-1] is None or len(findall('py.test', a[1])) > 0:
                 # interactive python
                 return './interactive/p' + str(mpi.main_size)