opencontrail: Remove python:version (typo??)

e54d60efa62ee5a74ecb9b5b6484c92be73760bf

```
Depends: contrail-config (= 1.06-1-2014051407331), python-keystoneclient, python-novaclient, upstart-job, python:any (<< 2.8), python, python-zope.interface, python:any (>= 2.7.3-0ubuntu2~), 2.7
```