dont check vagrant inventory script for 2.6

tox.ini

@@ -8,7 +8,7 @@ whitelist_externals = make
 
 [testenv:py26]
 commands =
-    python -m compileall -fq -x 'test|samples' .
+    python -m compileall -fq -x 'test|samples|contrib/inventory/vagrant.py' .
     python2.4 -m compileall -fq -x 'module_utils/(a10|rax|openstack|ec2|gce).py' lib/ansible/module_utils
     make tests
 deps = -r{toxinidir}/test-requirements.txt