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.

Uncap eventlet at the same time to make the requirements match the
global list.

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

Change-Id: I3d4c66be32a7e5f1bae11fcba9491f9e26b59bb6
Depends-On: https://review.openstack.org/555034
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

.zuul.yaml

@@ -47,7 +47,9 @@
       jobs:
         - blazar-devstack-dsvm
         - blazar-devstack-dsvm-py35
+        - openstack-tox-lower-constraints
     gate:
       jobs:
         - blazar-devstack-dsvm
         - blazar-devstack-dsvm-py35
+        - openstack-tox-lower-constraints

lower-constraints.txt

@@ -0,0 +1,121 @@
+alabaster==0.7.10
+alembic==0.8.10
+amqp==2.2.2
+appdirs==1.4.3
+astroid==1.3.8
+Babel==2.3.4
+beautifulsoup4==4.6.0
+cachetools==2.0.1
+certifi==2018.1.18
+chardet==3.0.4
+click==6.7
+contextlib2==0.5.5
+coverage==4.0
+debtcollector==1.19.0
+decorator==4.2.1
+docutils==0.14
+dogpile.cache==0.6.5
+dulwich==0.19.0
+enum-compat==0.0.2
+eventlet==0.18.2
+extras==1.0.0
+fasteners==0.14.1
+fixtures==3.0.0
+flake8==2.5.5
+Flask==0.10
+futurist==1.6.0
+greenlet==0.4.13
+hacking==0.12.0
+idna==2.6
+imagesize==1.0.0
+iso8601==0.1.11
+itsdangerous==0.24
+Jinja2==2.10
+keystoneauth1==3.4.0
+keystonemiddleware==4.17.0
+kombu==4.0.0
+linecache2==1.0.0
+logilab-common==1.4.1
+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==0.7.18
+netifaces==0.10.6
+nose==1.3.7
+openstackdocstheme==1.18.1
+os-api-ref==1.4.0
+os-client-config==1.29.0
+oslo.cache==1.29.0
+oslo.concurrency==3.26.0
+oslo.config==5.2.0
+oslo.context==2.19.2
+oslo.db==4.27.0
+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
+Paste==2.0.3
+PasteDeploy==1.5.2
+pbr==2.0.0
+pecan==1.0.0
+pep8==1.5.7
+pika-pool==0.1.3
+pika==0.10.0
+prettytable==0.7.2
+pycadf==2.7.0
+pyflakes==0.8.1
+Pygments==2.2.0
+pyinotify==0.9.6
+pylint==1.4.5
+pyparsing==2.2.0
+python-dateutil==2.7.0
+python-editor==1.0.3
+python-keystoneclient==3.8.0
+python-mimeparse==1.6.0
+python-novaclient==9.1.0
+python-subunit==1.2.0
+pytz==2018.3
+PyYAML==3.12
+reno==2.5.0
+repoze.lru==0.7
+requests==2.18.4
+requestsexceptions==1.4.0
+rfc3986==1.1.0
+Routes==2.3.1
+simplegeneric==0.8.1
+simplejson==3.13.2
+six==1.10.0
+snowballstemmer==1.2.1
+Sphinx==1.6.2
+sphinxcontrib-websupport==1.0.1
+sqlalchemy-migrate==0.11.0
+SQLAlchemy==1.0.10
+sqlparse==0.2.4
+statsd==3.2.2
+stevedore==1.20.0
+Tempita==0.5.2
+tenacity==4.9.0
+testrepository==0.0.18
+testresources==2.0.1
+testscenarios==0.4
+testtools==2.2.0
+traceback2==1.4.0
+unittest2==1.1.0
+urllib3==1.22
+vine==1.1.4
+waitress==1.1.0
+WebOb==1.7.1
+WebTest==2.0.29
+Werkzeug==0.14.1
+wrapt==1.10.11
+WSME==0.8.0

requirements.txt

@@ -5,7 +5,7 @@ pbr!=2.1.0,>=2.0.0 # Apache-2.0
 
 alembic>=0.8.10 # MIT
 Babel!=2.4.0,>=2.3.4 # BSD
-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
 Flask!=0.11,<1.0,>=0.10 # BSD
 iso8601>=0.1.11 # MIT
 keystonemiddleware>=4.17.0 # Apache-2.0

tox.ini

@@ -59,4 +59,10 @@ commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasen
 # the API Ref to developer.openstack.org.
 commands =
     rm -rf api-ref/build
-    sphinx-build -WE -b html -d api-ref/build/doctrees api-ref/source api-ref/build/html
+    sphinx-build -WE -b html -d api-ref/build/doctrees api-ref/source api-ref/build/html
+[testenv:lower-constraints]
+basepython = python3
+deps =
+  -c{toxinidir}/lower-constraints.txt
+  -r{toxinidir}/test-requirements.txt
+  -r{toxinidir}/requirements.txt