tests.functional: fix missing import

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2678 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/tests/functional/__init__.py

@@ -15,6 +15,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 
+import errno
 import os
 import sys
 import time