Just marked a review as needing a recheck on this.  My exact traceback was different, but I'm pretty sure that it's the same underlying issue:

https://review.openstack.org/#/c/74242/
http://logs.openstack.org/42/74242/7/check/check-tempest-dsvm-postgres-full/db56c66/console.html

2014-03-04 23:57:58.525 | Downloading/unpacking pip>=1.4 from https://pypi.python.org/packages/source/p/pip/pip-1.5.4.tar.gz#md5=834b2904f92d46aaa333267fb1c922bb (from pbr>=0.6,<1.0->tempest==2014.1.dev3306.g652a624)
2014-03-04 23:57:58.525 |   Error <urlopen error _ssl.c:489: The handshake operation timed out> while getting https://pypi.python.org/packages/source/p/pip/pip-1.5.4.tar.gz#md5=834b2904f92d46aaa333267fb1c922bb
2014-03-04 23:57:58.525 | Cleaning up...
2014-03-04 23:57:58.525 | Exception:
2014-03-04 23:57:58.525 | Traceback (most recent call last):
2014-03-04 23:57:58.525 |   File "/opt/stack/new/tempest/.tox/full/local/lib/python2.7/site-packages/pip/basecommand.py", line 134, in main
2014-03-04 23:57:58.525 |     status = self.run(options, args)
2014-03-04 23:57:58.525 |   File "/opt/stack/new/tempest/.tox/full/local/lib/python2.7/site-packages/pip/commands/install.py", line 236, in run
2014-03-04 23:57:58.525 |     requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
2014-03-04 23:57:58.526 |   File "/opt/stack/new/tempest/.tox/full/local/lib/python2.7/site-packages/pip/req.py", line 1092, in prepare_files
2014-03-04 23:57:58.526 |     self.unpack_url(url, location, self.is_download)
2014-03-04 23:57:58.526 |   File "/opt/stack/new/tempest/.tox/full/local/lib/python2.7/site-packages/pip/req.py", line 1238, in unpack_url
2014-03-04 23:57:58.526 |     retval = unpack_http_url(link, location, self.download_cache, self.download_dir)
2014-03-04 23:57:58.526 |   File "/opt/stack/new/tempest/.tox/full/local/lib/python2.7/site-packages/pip/download.py", line 602, in unpack_http_url
2014-03-04 23:57:58.526 |     resp = _get_response_from_url(target_url, link)
2014-03-04 23:57:58.526 |   File "/opt/stack/new/tempest/.tox/full/local/lib/python2.7/site-packages/pip/download.py", line 638, in _get_response_from_url
2014-03-04 23:57:58.526 |     resp = urlopen(target_url)
2014-03-04 23:57:58.526 |   File "/opt/stack/new/tempest/.tox/full/local/lib/python2.7/site-packages/pip/download.py", line 176, in __call__
2014-03-04 23:57:58.526 |     response = self.get_opener(scheme=scheme).open(url)
2014-03-04 23:57:58.526 |   File "/usr/lib/python2.7/urllib2.py", line 400, in open
2014-03-04 23:57:58.527 |     response = self._open(req, data)
2014-03-04 23:57:58.527 |   File "/usr/lib/python2.7/urllib2.py", line 418, in _open
2014-03-04 23:57:58.527 |     '_open', req)
2014-03-04 23:57:58.527 |   File "/usr/lib/python2.7/urllib2.py", line 378, in _call_chain
2014-03-04 23:57:58.527 |     result = func(*args)
2014-03-04 23:57:58.527 |   File "/opt/stack/new/tempest/.tox/full/local/lib/python2.7/site-packages/pip/download.py", line 155, in https_open
2014-03-04 23:57:58.527 |     return self.do_open(self.specialized_conn_class, req)
2014-03-04 23:57:58.527 |   File "/usr/lib/python2.7/urllib2.py", line 1177, in do_open
2014-03-04 23:57:58.527 |     raise URLError(err)
2014-03-04 23:57:58.527 | URLError: <urlopen error _ssl.c:489: The handshake operation timed out>