fix backward compatibility of onelab.path

contrib/onelab/python/onelab.py

@@ -30,17 +30,11 @@ Please report all bugs and problems to the public mailing list
 import socket, struct, os, sys, subprocess, time
 _VERSION = '1.1'
 
-def file_exist(filename):
-  try:
-    with open(filename) as f:
-      return True
-  except IOError:
-    return False
-
 def path(dirname, inp):
   # dirname is a directory, can be empty
   # inp is an optional file or subdirectory name
   # returns the path to 'inp' in the same directory as 'ref' 
+  dirname = os.path.dirname(dirname)
   if not inp: 
     return dirname
   if inp[0] == '/' or inp[0] == '\\' or (len(inp) > 2 and inp[1] == '\:'):