All gate jobs failed with "could not install reps"

[Oleksandr Minakov]

Downloading/unpacking blist (from cassandra-driver>=1.0.0->-r /home/jenkins/workspace/gate-magnetodb-python27/requirements.txt (line 1))
   Running setup.py egg_info for package blist
     Traceback (most recent call last):
       File "<string>", line 16, in <module>
       File "/home/jenkins/workspace/gate-magnetodb-python27/.tox/py27/build/blist/setup.py", line 5, in <module>
         import ez_setup
     ImportError: No module named ez_setup
     Complete output from command python setup.py egg_info:
     Traceback (most recent call last):

   File "<string>", line 16, in <module>

   File "/home/jenkins/workspace/gate-magnetodb-python27/.tox/py27/build/blist/setup.py", line 5, in <module>

     import ez_setup

 ImportError: No module named ez_setup

 ----------------------------------------
 Cleaning up...
 Command python setup.py egg_info failed with error code 1 in /home/jenkins/workspace/gate-magnetodb-python27/.tox/py27/build/blist
 Storing complete log in /home/jenkins/.pip/pip.log

 ERROR: could not install deps [-r/home/jenkins/workspace/gate-magnetodb-python27/requirements.txt, -r/home/jenkins/workspace/gate-magnetodb-python27/test-req