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: I4e0053c833d821bb7086c8feb9e44eb927c23fab
Depends-On: https://review.openstack.org/555034
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

.zuul.yaml

@@ -3,7 +3,9 @@
       jobs:
         - openstack-tox-functional-with-sudo
         - kuryr-kubernetes-tempest-daemon-octavia
+        - openstack-tox-lower-constraints
     gate:
       jobs:
         - openstack-tox-functional-with-sudo
         - kuryr-kubernetes-tempest-daemon-octavia
+        - openstack-tox-lower-constraints

lower-constraints.txt

@@ -0,0 +1,91 @@
+alabaster==0.7.10
+amqp==2.2.2
+appdirs==1.3.0
+Babel==2.5.3
+cachetools==2.0.1
+cffi==1.11.5
+contextlib2==0.5.5
+coverage==4.0
+debtcollector==1.19.0
+docutils==0.11
+dulwich==0.15.0
+enum-compat==0.0.2
+eventlet==0.20.0
+extras==1.0.0
+fasteners==0.14.1
+fixtures==3.0.0
+flake8==2.2.4
+future==0.16.0
+futurist==1.6.0
+greenlet==0.4.13
+hacking==0.10.2
+imagesize==0.7.1
+iso8601==0.1.12
+Jinja2==2.10
+keystoneauth1==3.4.0
+kombu==4.1.0
+linecache2==1.0.0
+MarkupSafe==1.0
+mccabe==0.2.1
+mock==2.0.0
+monotonic==1.4
+mox3==0.20.0
+msgpack-python==0.4.0
+msgpack==0.5.6
+netaddr==0.7.18
+netifaces==0.10.6
+openstackdocstheme==1.17.0
+os-client-config==1.28.0
+oslo.concurrency==3.20.0
+oslo.config==5.1.0
+oslo.context==2.20.0
+oslo.i18n==3.15.3
+oslo.log==3.30.0
+oslo.messaging==5.36.0
+oslo.middleware==3.35.0
+oslo.privsep==1.23.0
+oslo.serialization==2.25.0
+oslo.service==1.30.0
+oslo.utils==3.36.0
+oslo.versionedobjects==1.28.0
+oslotest==1.10.0
+Paste==2.0.3
+PasteDeploy==1.5.2
+pbr==2.0.0
+pep8==1.5.7
+pika-pool==0.1.3
+pika==0.11.2
+prettytable==0.7.2
+pycparser==2.18
+pyflakes==0.8.1
+Pygments==2.2.0
+pyinotify==0.9.6
+pyparsing==2.2.0
+pyroute2==0.4.21
+python-dateutil==2.7.0
+python-mimeparse==1.6.0
+python-subunit==1.0.0
+pytz==2018.3
+PyYAML==3.12
+reno==2.5.0
+repoze.lru==0.7
+requests==2.14.2
+requestsexceptions==1.2.0
+rfc3986==1.1.0
+Routes==2.4.1
+six==1.10.0
+snowballstemmer==1.2.1
+Sphinx==1.6.2
+sphinxcontrib-websupport==1.0.1
+statsd==3.2.2
+stestr==1.0.0
+stevedore==1.20.0
+tenacity==4.9.0
+testrepository==0.0.18
+testscenarios==0.4
+testtools==2.2.0
+traceback2==1.4.0
+unittest2==1.1.0
+vine==1.1.4
+WebOb==1.7.4
+wrapt==1.10.11

tox.ini

@@ -78,3 +78,12 @@ max-complexity=30
 
 [hacking]
 import_exceptions = os_vif.i18n
+
+[testenv:lower-constraints]
+basepython = python3
+deps =
+  -c{toxinidir}/lower-constraints.txt
+  -r{toxinidir}/test-requirements.txt
+  -r{toxinidir}/requirements.txt
+commands =
+    stestr run --black-regex ".tests.functional" '{posargs}'