[gate] dsvm job is red, due to pip8 release

[Kirill Zaitsev]

see logs for https://review.openstack.org/#/c/270743/

2016-01-21 11:59:29.241 | 2016-01-21 11:59:29.228 | Downloading http://pypi.ORD.openstack.org/packages/source/p/pycparser/pycparser-2.14.tar.gz (223kB)
2016-01-21 11:59:29.497 | 2016-01-21 11:59:29.484 | Installing collected packages: pyparsing, cmd2, argparse, six, stevedore, unicodecsv, PyYAML, PrettyTable, cliff, anyjson, httplib2, functools32, jsonschema, linecache2, traceback2, extras, unittest2, python-mimeparse, testtools, ecdsa, pycrypto, paramiko, netaddr, fixtures, python-subunit, testrepository, idna, pyasn1, enum34, ipaddress, pycparser, cffi, cryptography, pyOpenSSL, oslo.config, pytz, Babel, oslo.i18n, monotonic, fasteners, retrying, funcsigs, netifaces, wrapt, debtcollector, iso8601, oslo.utils, oslo.concurrency, msgpack-python, oslo.serialization, python-dateutil, pyinotify, oslo.context, oslo.log, testscenarios, os-testr, tempest-lib, mccabe, pyflakes, pep8, flake8, hacking, Pygments, docutils, MarkupSafe, Jinja2, sphinx, requests, oslosphinx, mox, mock, coverage, mox3, appdirs, requestsexceptions, keystoneauth1, os-client-config, oslotest
2016-01-21 11:59:29.561 | 2016-01-21 11:59:29.548 | Running setup.py install for cmd2: started
2016-01-21 11:59:29.747 | 2016-01-21 11:59:29.734 | [?25l Running setup.py install for cmd2: finished with status 'done'
2016-01-21 11:59:29.748 | 2016-01-21 11:59:29.736 | [?25h Found existing installation: argparse 1.2.1
2016-01-21 11:59:29.914 | 2016-01-21 11:59:29.901 | Detected a distutils installed project ('argparse') which we cannot uninstall. The metadata provided by distutils does not contain a list of files which have been installed, so pip does not know which files to uninstall.

This is due to https://github.com/pypa/pip/issues/3384