stack.sh fails installing keystone requirements

[Ivan Kolodyazhny]

Running stack.sh on the fresh master:
+ cd /opt/stack/requirements
+ python update.py /opt/stack/keystone
Traceback (most recent call last):
  File "update.py", line 274, in <module>
    main(options, args)
  File "update.py", line 259, in main
    _copy_requires(options.suffix, options.softupdate, args[0])
  File "update.py", line 219, in _copy_requires
    source_reqs = _parse_reqs('global-requirements.txt')
  File "update.py", line 140, in _parse_reqs
    reqs[_parse_pip(pip)] = pip
  File "update.py", line 101, in _parse_pip
    elif install_require.url:
  File "/usr/local/lib/python2.7/dist-packages/pip/req/req_install.py", line 128, in url
    return self.link.url
AttributeError: 'NoneType' object has no attribute 'url'
+ exit_trap
+ local r=1
++ jobs -p
+ jobs=
+ [[ -n '' ]]
+ kill_spinner
+ '[' '!' -z '' ']'
+ [[ 1 -ne 0 ]]
+ echo 'Error on exit'
Error on exit
+ [[ -z /opt/stack/logs ]]
+ /home/e0ne/devstack/tools/worlddump.py -d /opt/stack/logs
World dumping... see /opt/stack/logs/worlddump-2015-04-17-152725.txt for details
+ exit 1

[Sean Dague (sdague)]

This devstack bug was last updated over 180 days ago, as devstack
is a fast moving project and we'd like to get the tracker down to
currently actionable bugs, this is getting marked as Invalid. If the
issue still exists, please feel free to reopen it.