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.

In order to add the lower-constraints.txt file, we have to have the
other requirements lists match the global list. In this case, that means
also uncapping eventlet. The global upper-constraints.txt file will
continue to enforce the version of eventlet used in test jobs.

See http://lists.openstack.org/pipermail/openstack-dev/2018-March/128352.html
for more details.

Change-Id: Ic7dc18c2416c2eca5a605f28e17034cedb777a05
Depends-On: https://review.openstack.org/555034
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

.zuul.yaml

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

lower-constraints.txt

@@ -0,0 +1,127 @@
+alabaster==0.7.10
+amqp==2.2.2
+appdirs==1.4.3
+asn1crypto==0.24.0
+Babel==2.3.4
+cachetools==2.0.1
+certifi==2018.1.18
+cffi==1.11.5
+chardet==3.0.4
+cliff==2.11.0
+cmd2==0.8.1
+contextlib2==0.5.5
+coverage==4.0
+cryptography==2.1.4
+debtcollector==1.19.0
+decorator==4.2.1
+deprecation==2.0
+docutils==0.14
+dogpile.cache==0.6.5
+dulwich==0.19.0
+elasticsearch==2.0.0
+enum-compat==0.0.2
+eventlet==0.18.2
+extras==1.0.0
+fasteners==0.14.1
+fixtures==3.0.0
+flake8==2.2.4
+futurist==1.6.0
+greenlet==0.4.10
+hacking==0.10.0
+httplib2==0.9.1
+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
+keystonemiddleware==4.17.0
+kombu==4.1.0
+linecache2==1.0.0
+MarkupSafe==1.0
+mccabe==0.2.1
+mock==2.0.0
+monotonic==1.4
+mox3==0.25.0
+msgpack==0.5.6
+munch==2.2.0
+netaddr==0.7.19
+netifaces==0.10.6
+openstackdocstheme==1.18.1
+openstacksdk==0.12.0
+os-api-ref==1.4.0
+os-client-config==1.29.0
+os-service-types==1.2.0
+osc-lib==1.10.0
+oslo.cache==1.29.0
+oslo.concurrency==3.25.0
+oslo.config==5.1.0
+oslo.context==2.19.2
+oslo.i18n==3.15.3
+oslo.log==3.36.0
+oslo.messaging==5.29.0
+oslo.middleware==3.31.0
+oslo.policy==1.30.0
+oslo.serialization==2.18.0
+oslo.service==1.24.0
+oslo.utils==3.33.0
+oslotest==3.2.0
+osprofiler==1.4.0
+packaging==17.1
+Paste==2.0.2
+PasteDeploy==1.5.0
+pbr==2.0.0
+pep8==1.5.7
+pika-pool==0.1.3
+pika==0.10.0
+prettytable==0.7.2
+psutil==3.2.2
+pycadf==2.7.0
+pycparser==2.18
+pyflakes==0.8.1
+Pygments==2.2.0
+pyinotify==0.9.6
+pyOpenSSL==16.2.0
+pyparsing==2.2.0
+pyperclip==1.6.0
+python-cinderclient==3.3.0
+python-dateutil==2.7.0
+python-designateclient==2.7.0
+python-glanceclient==2.8.0
+python-ironicclient==2.2.0
+python-keystoneclient==3.8.0
+python-mimeparse==1.6.0
+python-neutronclient==6.7.0
+python-novaclient==9.1.0
+python-subunit==1.2.0
+python-swiftclient==3.2.0
+pytz==2018.3
+PyYAML==3.12
+reno==2.5.0
+repoze.lru==0.7
+requests==2.14.2
+requestsexceptions==1.4.0
+rfc3986==1.1.0
+Routes==2.3.1
+simplegeneric==0.8.1
+simplejson==3.5.1
+six==1.10.0
+snowballstemmer==1.2.1
+Sphinx==1.6.2
+sphinxcontrib-websupport==1.0.1
+statsd==3.2.2
+stevedore==1.20.0
+tenacity==4.9.0
+testrepository==0.0.18
+testtools==2.2.0
+traceback2==1.4.0
+unittest2==1.1.0
+urllib3==1.22
+vine==1.1.4
+warlock==1.3.0
+WebOb==1.7.1
+wrapt==1.10.11
+WSME==0.8.0

requirements.txt

@@ -9,7 +9,7 @@ pbr!=2.1.0,>=2.0.0 # Apache-2.0
 # package to get the right headers...
 greenlet>=0.4.10 # MIT
 
-eventlet!=0.18.3,!=0.20.1,<0.21.0,>=0.18.2 # MIT
+eventlet!=0.18.3,!=0.20.1,>=0.18.2 # MIT
 PasteDeploy>=1.5.0 # MIT
 Routes>=2.3.1 # MIT
 WebOb>=1.7.1 # MIT

tox.ini

@@ -66,3 +66,10 @@ exclude = .venv,.git,.tox,dist,doc,etc,*searchlight/locale*,*lib/python*,*egg,bu
 [hacking]
 local-check-factory = searchlight.hacking.checks.factory
 import_exceptions = searchlight.i18n
+
+[testenv:lower-constraints]
+basepython = python3
+deps =
+  -c{toxinidir}/lower-constraints.txt
+  -r{toxinidir}/test-requirements.txt
+  -r{toxinidir}/requirements.txt