Description of problem:

Can be noticed in the CI jobs that use http://git.app.eng.bos.redhat.com/git/tripleo-environments.git/tree/ci-scripts/prep-internal-rhel.sh

Ex: 

https://rhos-dev-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/job/periodic-ocata-rdo_trunk-featureset020-1ctlr_1comp_64gb/62/console

https://rhos-dev-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/user/agopi/my-views/view/Browbeat_view/job/browbeat-quickstart-gerrit-queens-baremetal-CI/91/console



Where: 

Occuring on all versions 


Following is the error: 

 Collecting cliff (from ara==0.14.5->-r requirements.txt (line 2))
08:49:22   Using cached https://files.pythonhosted.org/packages/7e/1c/4582dc9b2cb5164c665221aca70013003a2dbbd0ef837b72f43c62a350c4/cliff-2.12.1.tar.gz
08:49:24     Complete output from command python setup.py egg_info:
08:49:24     /home/rhos-ci/jenkins/workspace/periodic-ocata-rdo_trunk-featureset020-1ctlr_1comp_64gb/lib/python2.7/site-packages/pkg_resources/__init__.py:2510: PEP440Warning: 'pbr (0.5.2.5.g5b3e942)' is being parsed as a legacy, non PEP 440, version. You may find odd behavior and sort order. In particular it will be sorted as less than 0.0. It is recommend to migrate to PEP 440 compatible versions.
08:49:24       PEP440Warning,
08:49:24     /usr/lib64/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'long_description_content_type'
08:49:24       warnings.warn(msg)
08:49:24     /usr/lib64/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'project_urls'
08:49:24       warnings.warn(msg)
08:49:24     
08:49:24     Installed /tmp/pip-install-raSytd/cliff/.eggs/pbr-4.0.4-py2.7.egg
08:49:24     Marker evaluation failed, see the following error.  For more information see: http://docs.openstack.org/developer/pbr/compatibility.html#evaluate-marker
08:49:24     ERROR:root:Error parsing
08:49:24     Traceback (most recent call last):
08:49:24       File "/tmp/pip-install-raSytd/cliff/.eggs/pbr-4.0.4-py2.7.egg/pbr/core.py", line 96, in pbr
08:49:24         attrs = util.cfg_to_args(path, dist.script_args)
08:49:24       File "/tmp/pip-install-raSytd/cliff/.eggs/pbr-4.0.4-py2.7.egg/pbr/util.py", line 260, in cfg_to_args
08:49:24         kwargs = setup_cfg_to_setup_kwargs(config, script_args)
08:49:24       File "/tmp/pip-install-raSytd/cliff/.eggs/pbr-4.0.4-py2.7.egg/pbr/util.py", line 454, in setup_cfg_to_setup_kwargs
08:49:24         if pkg_resources.evaluate_marker('(%s)' % env_marker):
08:49:24       File "/home/rhos-ci/jenkins/workspace/periodic-ocata-rdo_trunk-featureset020-1ctlr_1comp_64gb/lib/python2.7/site-packages/pkg_resources/__init__.py", line 1481, in evaluate_marker
08:49:24         return cls.interpret(parser.expr(text).totuple(1)[1])
08:49:24       File "/home/rhos-ci/jenkins/workspace/periodic-ocata-rdo_trunk-featureset020-1ctlr_1comp_64gb/lib/python2.7/site-packages/pkg_resources/__init__.py", line 1515, in interpret
08:49:24         return op(nodelist)
08:49:24       File "/home/rhos-ci/jenkins/workspace/periodic-ocata-rdo_trunk-featureset020-1ctlr_1comp_64gb/lib/python2.7/site-packages/pkg_resources/__init__.py", line 1429, in atom
08:49:24         return cls.interpret(nodelist[2])
08:49:24       File "/home/rhos-ci/jenkins/workspace/periodic-ocata-rdo_trunk-featureset020-1ctlr_1comp_64gb/lib/python2.7/site-packages/pkg_resources/__init__.py", line 1515, in interpret
08:49:24         return op(nodelist)
08:49:24       File "/home/rhos-ci/jenkins/workspace/periodic-ocata-rdo_trunk-featureset020-1ctlr_1comp_64gb/lib/python2.7/site-packages/pkg_resources/__init__.py", line 1450, in comparison
08:49:24         raise SyntaxError(msg)
08:49:24     SyntaxError: '<' operator not allowed in environment markers
08:49:24     error in setup command: Error parsing /tmp/pip-install-raSytd/cliff/setup.cfg: SyntaxError: '<' operator not allowed in environment markers