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: Ic5f68cd606f5dd17e4cca2facf3141960180be26
Depends-On: https://review.openstack.org/555034
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

.zuul.yaml

@@ -4,9 +4,11 @@
         - freezer-ubuntu-xenial
         - freezer-centos-7:
             voting: false
+        - openstack-tox-lower-constraints
     gate:
       jobs:
         - freezer-ubuntu-xenial
+        - openstack-tox-lower-constraints
     experimental:
       jobs:
         - freezer-opensuse-423

lower-constraints.txt

@@ -0,0 +1,125 @@
+alabaster==0.7.10
+appdirs==1.4.3
+APScheduler==3.5.1
+asn1crypto==0.24.0
+astroid==1.3.8
+Babel==2.5.3
+bcrypt==3.1.4
+botocore==1.9.7
+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
+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
+future==0.16.0
+greenlet==0.4.13
+hacking==0.12.0
+idna==2.6
+imagesize==1.0.0
+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
+logilab-common==1.4.1
+MarkupSafe==1.0
+mccabe==0.4.0
+mock==2.0.0
+monotonic==1.4
+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-brick==2.3.0
+os-client-config==1.29.0
+os-service-types==1.2.0
+os-win==4.0.0
+osc-lib==1.10.0
+oslo.concurrency==3.26.0
+oslo.config==5.2.0
+oslo.context==2.20.0
+oslo.i18n==3.20.0
+oslo.log==3.37.0
+oslo.privsep==1.28.0
+oslo.serialization==2.25.0
+oslo.service==1.30.0
+oslo.utils==3.36.0
+packaging==17.1
+paramiko==2.4.1
+Paste==2.0.3
+PasteDeploy==1.5.2
+pbr==3.1.1
+pep8==1.7.1
+prettytable==0.7.2
+psutil==5.4.3
+pyasn1==0.4.2
+pycparser==2.18
+pycrypto==2.6.1
+pyflakes==1.0.0
+Pygments==2.2.0
+pyinotify==0.9.6
+pylint==1.4.5
+pymongo==3.6.1
+PyMySQL==0.8.0
+PyNaCl==1.2.1
+pyOpenSSL==17.5.0
+pyparsing==2.2.0
+pyperclip==1.6.0
+python-cinderclient==3.5.0
+python-dateutil==2.7.0
+python-freezerclient==1.6.0
+python-glanceclient==2.9.1
+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
+reno==2.7.0
+repoze.lru==0.7
+requests==2.18.4
+requestsexceptions==1.4.0
+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
+stestr==2.0.0
+stevedore==1.28.0
+tempest==18.0.0
+testrepository==0.0.20
+testtools==2.3.0
+traceback2==1.4.0
+tzlocal==1.5.1
+unittest2==1.1.0
+urllib3==1.22
+voluptuous==0.11.1
+warlock==1.3.0
+WebOb==1.7.4
+wrapt==1.10.11

tox.ini

@@ -79,3 +79,10 @@ exclude = .venv,.tox,dist,doc,test,*egg,releasenotes
 
 [testenv:releasenotes]
 commands = sphinx-build -a -E -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
+
+[testenv:lower-constraints]
+basepython = python3
+deps =
+  -c{toxinidir}/lower-constraints.txt
+  -r{toxinidir}/test-requirements.txt
+  -r{toxinidir}/requirements.txt