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: I45e5002c7edd44b828bfe057762ff98bd2fcec4e
Depends-On: https://review.openstack.org/555034
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

lower-constraints.txt

@@ -0,0 +1,73 @@
+alabaster==0.7.10
+appdirs==1.4.3
+asn1crypto==0.24.0
+Babel==2.5.3
+bcrypt==3.1.4
+certifi==2018.1.18
+cffi==1.11.5
+chardet==3.0.4
+coverage==4.5.1
+cryptography==2.1.4
+debtcollector==1.19.0
+doc8==0.8.0
+docutils==0.14
+dulwich==0.19.0
+extras==1.0.0
+fixtures==3.0.0
+flake8==2.5.5
+hacking==0.12.0
+idna==2.6
+imagesize==1.0.0
+iso8601==0.1.12
+Jinja2==2.10
+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
+netaddr==0.7.19
+netifaces==0.10.6
+openstackdocstheme==1.20.0
+os-client-config==1.29.0
+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
+paramiko==2.4.1
+pbr==3.1.1
+pep8==1.5.7
+pyasn1==0.4.2
+pycparser==2.18
+pyflakes==0.8.1
+Pygments==2.2.0
+pyinotify==0.9.6
+PyNaCl==1.2.1
+pyparsing==2.2.0
+python-dateutil==2.7.0
+python-mimeparse==1.6.0
+python-subunit==1.2.0
+pytz==2018.3
+PyYAML==3.12
+reno==2.7.0
+requests==2.18.4
+requestsexceptions==1.4.0
+restructuredtext-lint==1.1.3
+rfc3986==1.1.0
+six==1.11.0
+snowballstemmer==1.2.1
+Sphinx==1.6.5
+sphinxcontrib-websupport==1.0.1
+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
+wrapt==1.10.11

tox.ini

@@ -44,3 +44,10 @@ commands = oslo_debug_helper -t bifrost/tests {posargs}
 show-source = True
 ignore = F403,H102,H303
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,os_ironic.py,os_ironic_node.py,os_ironic_inspect.py,os_keystone_service.py
+
+[testenv:lower-constraints]
+basepython = python3
+deps =
+  -c{toxinidir}/lower-constraints.txt
+  -r{toxinidir}/test-requirements.txt
+  -r{toxinidir}/requirements.txt

zuul.d/project.yaml

@@ -19,8 +19,10 @@
             voting: false
         - bifrost-integration-tinyipa-centos-7:
             voting: false
+        - openstack-tox-lower-constraints
     gate:
       jobs:
         - bifrost-integration-tinyipa
         - bifrost-integration-tinyipa-fedora26
         - bifrost-integration-tinyipa-opensuse-423
+        - openstack-tox-lower-constraints