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: I11c8526b413e6dfc6e2457026ccc2f35e38d1699
Depends-On: https://review.openstack.org/555034
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

.zuul.yaml

@@ -2,6 +2,8 @@
     check:
       jobs:
         - watcherclient-tempest-functional
+        - openstack-tox-lower-constraints
     gate:
       jobs:
         - watcherclient-tempest-functional
+        - openstack-tox-lower-constraints

lower-constraints.txt

@@ -0,0 +1,92 @@
+alabaster==0.7.10
+appdirs==1.4.3
+asn1crypto==0.23.0
+Babel==2.5.3
+certifi==2018.1.18
+cffi==1.7.0
+chardet==3.0.4
+cliff==2.11.0
+cmd2==0.8.2
+coverage==4.0
+cryptography==2.1
+debtcollector==1.19.0
+decorator==4.2.1
+deprecation==2.0
+docutils==0.11
+dogpile.cache==0.6.5
+dulwich==0.15.0
+extras==1.0.0
+fasteners==0.7.0
+fixtures==3.0.0
+flake8==2.5.5
+future==0.16.0
+hacking==0.12.0
+idna==2.6
+imagesize==0.7.1
+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
+MarkupSafe==1.0
+mccabe==0.2.1
+mock==2.0.0
+monotonic==1.4
+mox3==0.20.0
+msgpack-python==0.4.0
+munch==2.2.0
+netaddr==0.7.19
+netifaces==0.10.6
+openstackdocstheme==1.18.1
+openstacksdk==0.12.0
+os-client-config==1.29.0
+os-service-types==1.2.0
+os-testr==1.0.0
+osc-lib==1.10.0
+oslo.concurrency==3.25.0
+oslo.config==5.2.0
+oslo.context==2.19.2
+oslo.i18n==3.20.0
+oslo.log==3.36.0
+oslo.serialization==2.18.0
+oslo.utils==3.36.0
+oslotest==3.2.0
+packaging==17.1
+paramiko==2.0.0
+pbr==3.1.1
+pep8==1.5.7
+prettytable==0.7.2
+pyasn1==0.1.8
+pycparser==2.18
+pyflakes==0.8.1
+Pygments==2.2.0
+pyinotify==0.9.6
+pyparsing==2.2.0
+pyperclip==1.6.0
+python-dateutil==2.5.3
+python-mimeparse==1.6.0
+python-subunit==1.0.0
+-e git://git.openstack.org/openstack/python-watcherclient@104894958882a4877dad6f469361d2adb41d0b59#egg=python_watcherclient
+pytz==2018.3
+PyYAML==3.12
+requests==2.18.4
+requestsexceptions==1.4.0
+rfc3986==0.3.1
+simplejson==3.13.2
+six==1.11.0
+snowballstemmer==1.2.1
+Sphinx==1.6.5
+sphinxcontrib-websupport==1.0.1
+stestr==1.0.0
+stevedore==1.28.0
+tempest==17.1.0
+testrepository==0.0.18
+testscenarios==0.4
+testtools==2.2.0
+traceback2==1.4.0
+unittest2==1.1.0
+urllib3==1.22
+wrapt==1.10.11

tox.ini

@@ -60,3 +60,11 @@ commands = python setup.py bdist_wheel
 
 [hacking]
 import_exceptions = watcherclient._i18n
+
+[testenv:lower-constraints]
+basepython = python3
+install_command = pip install -U {opts} {packages}
+deps =
+  -c{toxinidir}/lower-constraints.txt
+  -r{toxinidir}/test-requirements.txt
+  -r{toxinidir}/requirements.txt