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: I5753b175264c074ff722b47293c65063f0187ffe
Depends-On: https://review.openstack.org/555034
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

.zuul.d/project.yaml

@@ -0,0 +1,7 @@
+- project:
+    check:
+      jobs:
+        - openstack-tox-lower-constraints
+    gate:
+      jobs:
+        - openstack-tox-lower-constraints

lower-constraints.txt

@@ -0,0 +1,98 @@
+appdirs==1.4.3
+asn1crypto==0.24.0
+Babel==2.5.3
+bandit==1.4.0
+bashate==0.5.1
+beautifulsoup4==4.6.0
+certifi==2018.1.18
+cffi==1.11.5
+chardet==3.0.4
+cliff==2.11.0
+cmd2==0.8.1
+coverage==4.5.1
+cryptography==2.1.4
+ddt==1.1.2
+debtcollector==1.19.0
+decorator==4.2.1
+deprecation==2.0
+docker==3.1.1
+docker-pycreds==0.2.2
+dogpile.cache==0.6.5
+extras==1.0.0
+fixtures==3.0.0
+flake8==2.5.5
+gitdb==0.6.4
+gitdb2==2.0.3
+GitPython==2.1.8
+graphviz==0.8.2
+hacking==0.12.0
+idna==2.6
+iso8601==0.1.12
+Jinja2==2.10
+jmespath==0.9.3
+jsonpatch==1.21
+jsonpointer==2.0
+jsonschema==2.6.0
+keystoneauth1==3.4.0
+linecache2==1.0.0
+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
+openstacksdk==0.12.0
+os-client-config==1.29.0
+os-service-types==1.2.0
+osc-lib==1.10.0
+oslo.config==5.2.0
+oslo.context==2.20.0
+oslo.i18n==3.20.0
+oslo.log==3.37.0
+oslo.serialization==2.25.0
+oslo.utils==3.36.0
+oslotest==3.3.0
+packaging==17.1
+pbr==3.1.1
+pep8==1.5.7
+prettytable==0.7.2
+pycparser==2.18
+pyflakes==0.8.1
+pyinotify==0.9.6
+pyOpenSSL==17.5.0
+pyparsing==2.2.0
+pyperclip==1.6.0
+python-barbicanclient==4.6.0
+python-cinderclient==3.5.0
+python-dateutil==2.7.0
+python-glanceclient==2.9.1
+python-heatclient==1.14.0
+python-keystoneclient==3.15.0
+python-mimeparse==1.6.0
+python-neutronclient==6.7.0
+python-novaclient==10.1.0
+python-openstackclient==3.14.0
+python-subunit==1.2.0
+python-swiftclient==3.5.0
+pytz==2018.3
+PyYAML==3.12
+requests==2.18.4
+requestsexceptions==1.4.0
+rfc3986==1.1.0
+simplejson==3.13.2
+six==1.11.0
+smmap==0.9.0
+smmap2==2.0.3
+stevedore==1.28.0
+testrepository==0.0.20
+testscenarios==0.5.0
+testtools==2.3.0
+traceback2==1.4.0
+unittest2==1.1.0
+urllib3==1.22
+warlock==1.3.0
+websocket-client==0.47.0
+wrapt==1.10.11

tox.ini

@@ -257,3 +257,10 @@ exclude=.eggs,.git,.tox,doc
 
 [hacking]
 local-check-factory = kolla.hacking.checks.factory
+
+[testenv:lower-constraints]
+basepython = python3
+deps =
+  -c{toxinidir}/lower-constraints.txt
+  -r{toxinidir}/test-requirements.txt
+  -r{toxinidir}/requirements.txt