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: I8d773d4ee3d0835fb2a9183fe2154e82db085bd5
Depends-On: https://review.openstack.org/555034
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

lower-constraints.txt

@@ -0,0 +1,101 @@
+alabaster==0.7.10
+appdirs==1.4.3
+Babel==2.5.3
+bashate==0.5.1
+beautifulsoup4==4.6.0
+certifi==2018.1.18
+chardet==3.0.4
+cliff==2.11.0
+cmd2==0.8.1
+coverage==4.5.1
+debtcollector==1.19.0
+doc8==0.8.0
+docutils==0.14
+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
+future==0.16.0
+greenlet==0.4.13
+hacking==1.0.0
+idna==2.6
+imagesize==1.0.0
+ironic-lib==2.12.0
+iso8601==0.1.12
+Jinja2==2.10
+keystoneauth1==3.4.0
+linecache2==1.0.0
+logutils==0.3.5
+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
+netaddr==0.7.19
+netifaces==0.10.6
+openstackdocstheme==1.20.0
+os-client-config==1.29.0
+os-testr==1.0.0
+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.serialization==2.25.0
+oslo.service==1.30.0
+oslo.utils==3.36.0
+oslotest==3.3.0
+Paste==2.0.3
+PasteDeploy==1.5.2
+pbr==3.1.1
+pecan==1.2.1
+pep8==1.5.7
+Pint==0.8.1
+prettytable==0.7.2
+psutil==5.4.3
+pycodestyle==2.3.1
+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-mimeparse==1.6.0
+python-subunit==1.2.0
+pytz==2018.3
+pyudev==0.21.0
+PyYAML==3.12
+reno==2.7.0
+repoze.lru==0.7
+requests==2.18.4
+requestsexceptions==1.4.0
+restructuredtext-lint==1.1.3
+rfc3986==1.1.0
+Routes==2.4.1
+rtslib-fb==2.1.66
+simplegeneric==0.8.1
+six==1.11.0
+snowballstemmer==1.2.1
+Sphinx==1.6.5
+sphinxcontrib-httpdomain==1.6.1
+sphinxcontrib-pecanwsme==0.8.0
+sphinxcontrib-websupport==1.0.1
+stestr==2.0.0
+stevedore==1.28.0
+testrepository==0.0.20
+testtools==2.3.0
+traceback2==1.4.0
+unittest2==1.1.0
+urllib3==1.22
+voluptuous==0.11.1
+waitress==1.1.0
+WebOb==1.7.4
+WebTest==2.0.29
+wrapt==1.10.11
+WSME==0.9.2

tox.ini

@@ -95,3 +95,10 @@ envdir = {toxworkdir}/venv
 commands =
   oslo-config-generator --config-file=tools/config/ipa-config-generator.conf
 
+
+[testenv:lower-constraints]
+basepython = python3
+deps =
+  -c{toxinidir}/lower-constraints.txt
+  -r{toxinidir}/test-requirements.txt
+  -r{toxinidir}/requirements.txt

zuul.d/project.yaml

@@ -14,6 +14,7 @@
             voting: false
         - openstack-tox-functional:
             voting: false
+        - openstack-tox-lower-constraints
     gate:
       queue: ironic
       jobs:
@@ -25,6 +26,7 @@
         - ipa-tempest-dsvm-wholedisk-bios-agent_ipmitool-tinyipa-src
         - ipa-tempest-dsvm-wholedisk-bios-pxe_ipmitool-coreos-src
         - ipa-tempest-dsvm-wholedisk-bios-pxe_ipmitool-tinyipa-src
+        - openstack-tox-lower-constraints
     experimental:
       jobs:
         - ipa-tempest-dsvm-partition-bios-pxe_ipmitool-tinyipa256-src