python-ldap 2.4.20 causing install issues

I use the lastest devstack and lastest keystone, and the install error from devstack is like this:

2015-07-08 07:15:36.238 | + local name=keystone
2015-07-08 07:15:36.238 | + /opt/stack/requirements/.venv/bin/edit-constraints /opt/stack/requirements/upper-constraints.txt -- keystone '-e file:///opt/stack/keystone#egg=keystone'
2015-07-08 07:15:36.315 | + setup_package /opt/stack/keystone -e
2015-07-08 07:15:36.315 | + local project_dir=/opt/stack/keystone
2015-07-08 07:15:36.315 | + local flags=-e
2015-07-08 07:15:36.315 | + pip_install -e /opt/stack/keystone
2015-07-08 07:15:36.592 | + sudo -H http_proxy=http://proxy01.cd.intel.com:911 https_proxy=http://proxy01.cd.intel.com:911 'no_proxy=intel.com,*.intel.com,10.0.0.0/8,192.168.0.0/16,127.0.0.0/8,localhost,127.0.0.1,192.168.140.145' PIP_FIND_LINKS=file:///opt/stack/.wheelhouse /usr/local/bin/pip install -e /opt/stack/keystone
2015-07-08 07:15:37.358 | Obtaining file:///opt/stack/keystone
2015-07-08 07:15:38.004 | Complete output from command python setup.py egg_info:
2015-07-08 07:15:38.004 | error in setup command: 'tests_require' must be a string or list of strings containing valid project/version requirement specifiers; Expected ',' or end-of-list in python-ldap>=2.4;python_version=='2.7' at ;python_version=='2.7'
2015-07-08 07:15:38.004 |
2015-07-08 07:15:38.004 | ----------------------------------------
2015-07-08 07:15:38.004 | Command "python setup.py egg_info" failed with error code 1 in /opt/stack/keystone
2015-07-08 07:15:38.015 | + exit_trap
2015-07-08 07:15:38.015 | + local r=1
2015-07-08 07:15:38.016 | ++ jobs -p
2015-07-08 07:15:38.016 | + jobs=
2015-07-08 07:15:38.016 | + [[ -n '' ]]
2015-07-08 07:15:38.016 | + kill_spinner
2015-07-08 07:15:38.016 | + '[' '!' -z '' ']'
2015-07-08 07:15:38.016 | + [[ 1 -ne 0 ]]
2015-07-08 07:15:38.016 | + echo 'Error on exit'
2015-07-08 07:15:38.017 | Error on exit
2015-07-08 07:15:38.017 | + [[ -z /opt/stack/logs ]]
2015-07-08 07:15:38.017 | + /home/stack/devstack/devstack/tools/worlddump.py -d /opt/stack/logs
2015-07-08 07:15:38.051 | df: '/run/user/112/gvfs': Permission denied
2015-07-08 07:15:38.484 | + exit 1
stack@stack-PC44-8000:~/devstack/devstack$ 2015-07-08 07:15:38.490 | /bin/sh: 1: kill: Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or
2015-07-08 07:15:38.490 | kill -l [exitstatus]

seems this line in https://review.openstack.org/#/c/197773/2/test-requirements.txt
python-ldap>=2.4;python_version=='2.7'