Blacklist setuptools 40.7.0

Setuptools 40.7.0 introduced support for non-ascii chars in setup.cfg [1],
which causes python2.7 based sphinx jobs to fail with str-unicode mismatch,
e.g. with [2]:

'error: 'builder' must be a list of strings (got u'html,man')

See issue [3].

[1] https://setuptools.readthedocs.io/en/latest/history.html#v40-7-0
[2] http://logs.openstack.org/periodic-stable/git.openstack.org/openstack/keystone/stable/queens/build-openstack-sphinx-docs/0ea4957/job-output.txt.gz#_2019-01-28_06_18_25_401045
[3] pypa/setuptools#1653

Change-Id: I8921639cc4a1edfa0ac9d46a7cc03549aa6189aa

global-requirements.txt

@@ -417,7 +417,8 @@ selenium>=2.50.1  # Apache-2.0
 # situations as progressive releases of projects are done.
 # Blacklist setuptools 34.0.0-34.3.2 due to https://github.com/pypa/setuptools/issues/951
 # Blacklist setuptools 36.2.0 due to https://github.com/pypa/setuptools/issues/1086
-setuptools>=16.0,!=24.0.0,!=34.0.0,!=34.0.1,!=34.0.2,!=34.0.3,!=34.1.0,!=34.1.1,!=34.2.0,!=34.3.0,!=34.3.1,!=34.3.2,!=36.2.0  # PSF/ZPL
+# Blacklist setuptools 40.7.0 due to https://github.com/pypa/setuptools/issues/1653
+setuptools>=16.0,!=24.0.0,!=34.0.0,!=34.0.1,!=34.0.2,!=34.0.3,!=34.1.0,!=34.1.1,!=34.2.0,!=34.3.0,!=34.3.1,!=34.3.2,!=36.2.0,!=40.7.0  # PSF/ZPL
 sphinx>=1.6.2,!=1.6.6  # BSD
 sphinx-testing>=0.7.2  # BSD License
 sphinxcontrib-actdiag>=0.8.5  # BSD