add lower-constraints job

Create a tox environment for running the unit tests against the lower
bounds of the dependencies.

Create a lower-constraints.txt to be used to enforce the lower bounds
in those tests.

Add openstack-tox-lower-constraints job to the zuul configuration.

See http://lists.openstack.org/pipermail/openstack-dev/2018-March/128352.html
for more details.

Change-Id: I8a5c47cb8e4d623776cd4335754184f6f7f0d398
Depends-On: https://review.openstack.org/555034
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

lower-constraints.txt

@@ -0,0 +1,131 @@
+alabaster==0.7.10
+alembic==0.9.8
+appdirs==1.4.3
+automaton==1.14.0
+Babel==2.5.3
+certifi==2018.1.18
+chardet==3.0.4
+click==6.7
+cliff==2.11.0
+cmd2==0.8.1
+construct==2.8.22
+contextlib2==0.5.5
+coverage==4.5.1
+debtcollector==1.19.0
+decorator==4.2.1
+deprecation==2.0
+doc8==0.8.0
+docutils==0.14
+dogpile.cache==0.6.5
+dulwich==0.19.0
+enum-compat==0.0.2
+eventlet==0.20.0
+extras==1.0.0
+fasteners==0.14.1
+fixtures==3.0.0
+flake8==2.5.5
+flake8-import-order==0.17.1
+Flask==0.12.2
+future==0.16.0
+futurist==1.6.0
+greenlet==0.4.13
+hacking==1.0.0
+idna==2.6
+imagesize==1.0.0
+ironic-lib==2.12.0
+iso8601==0.1.12
+itsdangerous==0.24
+Jinja2==2.10
+jmespath==0.9.3
+jsonpatch==1.21
+jsonpath-rw==1.4.0
+jsonpointer==2.0
+jsonschema==2.6.0
+keystoneauth1==3.4.0
+keystonemiddleware==4.21.0
+linecache2==1.0.0
+Mako==1.0.7
+MarkupSafe==1.0
+mccabe==0.2.1
+mock==2.0.0
+monotonic==1.4
+mox3==0.25.0
+msgpack==0.5.6
+munch==2.2.0
+netaddr==0.7.19
+netifaces==0.10.6
+openstackdocstheme==1.20.0
+openstacksdk==0.12.0
+os-client-config==1.29.0
+os-service-types==1.2.0
+os-testr==1.0.0
+osc-lib==1.10.0
+oslo.cache==1.29.0
+oslo.concurrency==3.26.0
+oslo.config==5.2.0
+oslo.context==2.20.0
+oslo.db==4.35.0
+oslo.i18n==3.20.0
+oslo.log==3.37.0
+oslo.middleware==3.35.0
+oslo.policy==1.34.0
+oslo.rootwrap==5.13.0
+oslo.serialization==2.25.0
+oslo.service==1.30.0
+oslo.utils==3.36.0
+oslotest==3.3.0
+packaging==17.1
+Paste==2.0.3
+PasteDeploy==1.5.2
+pbr==3.1.1
+pep8==1.5.7
+ply==3.11
+prettytable==0.7.2
+pycadf==2.7.0
+pycodestyle==2.3.1
+pydot3==1.0.9
+pyflakes==0.8.1
+Pygments==2.2.0
+pyinotify==0.9.6
+pyparsing==2.2.0
+pyperclip==1.6.0
+python-dateutil==2.7.0
+python-editor==1.0.3
+python-ironicclient==2.3.0
+python-keystoneclient==3.15.0
+python-mimeparse==1.6.0
+python-subunit==1.2.0
+python-swiftclient==3.5.0
+pytz==2018.3
+PyYAML==3.12
+reno==2.7.0
+repoze.lru==0.7
+requests==2.18.4
+requestsexceptions==1.4.0
+restructuredtext-lint==1.1.3
+retrying==1.3.3
+rfc3986==1.1.0
+Routes==2.4.1
+simplejson==3.13.2
+six==1.11.0
+snowballstemmer==1.2.1
+Sphinx==1.6.5
+sphinxcontrib-websupport==1.0.1
+SQLAlchemy==1.2.5
+sqlalchemy-migrate==0.11.0
+sqlparse==0.2.4
+statsd==3.2.2
+stestr==2.0.0
+stevedore==1.28.0
+Tempita==0.5.2
+testrepository==0.0.20
+testresources==2.0.1
+testscenarios==0.5.0
+testtools==2.3.0
+traceback2==1.4.0
+unittest2==1.1.0
+urllib3==1.22
+voluptuous==0.11.1
+WebOb==1.7.4
+Werkzeug==0.14.1
+wrapt==1.10.11

tox.ini

@@ -81,3 +81,10 @@ sitepackages = False
 deps = -r{toxinidir}/test-requirements.txt
 commands =
   python setup.py build_sphinx
+
+[testenv:lower-constraints]
+basepython = python3
+deps =
+  -c{toxinidir}/lower-constraints.txt
+  -r{toxinidir}/test-requirements.txt
+  -r{toxinidir}/requirements.txt

zuul.d/project.yaml

@@ -7,6 +7,7 @@
         - openstack-tox-functional
         - openstack-tox-functional-py35
         - ironic-tempest-dsvm-ironic-inspector
+        - openstack-tox-lower-constraints
     gate:
       queue: ironic
       jobs:
@@ -16,3 +17,4 @@
         - openstack-tox-functional
         - openstack-tox-functional-py35
         - ironic-tempest-dsvm-ironic-inspector
+        - openstack-tox-lower-constraints