coverage
pep8==1.7.1
flake8==3.5.0
astroid==1.6.4
pylint==1.8.4
pylint-plugin-utils>=0.2.6,<0.3
bandit==1.4.0
ipython<6.0.0
mock==2.0.0
nose>=1.3.7
tabulate
unittest2
sphinx==1.7.5
sphinx-autobuild
# nosetests enhancements
rednose
nose-timer>=0.7.2,<0.8
# splitting tests run on a separate CI machines
nose-parallel
# Required by st2client tests
pyyaml<4.0,>=3.12
RandomWords
gunicorn==19.7.1
psutil==5.4.5
webtest==2.0.25
rstcheck>=3.3.0,<3.4
pyrabbit
python-keyczar

coverage
pep8==1.7.1
flake8==3.5.0
astroid==1.6.4
pylint==1.8.4
pylint-plugin-utils>=0.2.6,<0.3
bandit==1.4.0
ipython<6.0.0
mock==2.0.0
nose>=1.3.7
tabulate
unittest2
sphinx==1.7.5
sphinx-autobuild
# nosetests enhancements
rednose
nose-timer>=0.7.2,<0.8
# splitting tests run on a separate CI machines
nose-parallel
# Required by st2client tests
pyyaml<4.0,>=3.12
RandomWords
gunicorn==19.7.1
psutil==5.4.5
webtest==2.0.25
rstcheck>=3.3.0,<3.4
pyrabbit
# Since StackStorm v2.8.0 we now use cryptography instead of keyczar, but we still have some tests
# which utilize keyczar and ensure new cryptography code is fully compatible with keyczar code
# (those tests only run under Python 2.7 since keyczar doesn't support Python 3.x).
# See https://github.com/StackStorm/st2/pull/4165
python-keyczar

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Add a comment on why that requirement is there.
