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: Ic189fc2d55534557029fec4150f7a7f3c9562d6e
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 +1,78 @@
+alabaster==0.7.10
+appdirs==1.3.0
+automaton==1.9.0
+Babel==2.3.4
+bashate==0.5.1
+cachetools==2.0.0
+contextlib2==0.4.0
+coverage==4.0
+debtcollector==1.2.0
+decorator==3.4.0
+docutils==0.11
+extras==1.0.0
+fasteners==0.7.0
+fixtures==3.0.0
+flake8==2.5.5
+future==0.16.0
+futurist==1.2.0
+hacking==0.12.0
+imagesize==0.7.1
+iso8601==0.1.11
+Jinja2==2.10
+jsonschema==2.6.0
+keystoneauth1==3.4.0
+linecache2==1.0.0
+lxml==3.4.1
+MarkupSafe==1.0
+mccabe==0.2.1
+mock==2.0.0
+monotonic==0.6
+mox3==0.20.0
+msgpack-python==0.4.0
+netaddr==0.7.18
+netifaces==0.10.4
+networkx==1.10
+os-client-config==1.28.0
+os-testr==1.0.0
+oslo.concurrency==3.25.0
+oslo.config==5.2.0
+oslo.context==2.19.2
+oslo.i18n==3.15.3
+oslo.log==3.36.0
+oslo.serialization==2.18.0
+oslo.utils==3.33.0
+oslosphinx==4.7.0
+oslotest==3.2.0
+pbr==2.0.0
+pep8==1.5.7
+prettytable==0.7.2
+pyasn1==0.1.8
+pyasn1-modules==0.0.6
+pyflakes==0.8.1
+Pygments==2.2.0
+pyinotify==0.9.6
+pyparsing==2.1.0
+pypowervm==1.1.11
+python-dateutil==2.5.3
+python-mimeparse==1.6.0
+python-subunit==1.0.0
+pytz==2013.6
+PyYAML==3.12
+requests==2.14.2
+requestsexceptions==1.2.0
+rfc3986==0.3.1
+setuptools==21.0.0
+six==1.10.0
+snowballstemmer==1.2.1
+Sphinx==1.6.5
+sphinxcontrib-websupport==1.0.1
+stestr==1.0.0
+stevedore==1.20.0
+taskflow==2.16.0
+tenacity==3.2.1
+testrepository==0.0.18
+testscenarios==0.4
+testtools==2.2.0
+traceback2==1.4.0
+unittest2==1.1.0
+wrapt==1.7.0

test-requirements.txt

@@ -12,6 +12,6 @@ testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT
 oslotest>=3.2.0 # Apache-2.0
 os-testr>=1.0.0 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.5 # BSD
 oslosphinx>=4.7.0 # Apache-2.0
 mock>=2.0.0 # BSD

tox.ini

@@ -17,7 +17,8 @@ deps =
        -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-       -egit+https://github.com/openstack/ceilometer#egg=ceilometer
+       -egit+https://git.openstack.org/openstack/ceilometer#egg=ceilometer
+       -rhttps://git.openstack.org/cgit/openstack/ceilometer/plain/test-requirements.txt
 whitelist_externals = bash
 commands = bash tools/pretty_tox.sh '{posargs}'
 
@@ -46,3 +47,12 @@ show-source = true
 
 [hacking]
 import_exceptions = ceilometer.openstack.common.gettextutils
+
+[testenv:lower-constraints]
+basepython = python3
+deps =
+  -c{toxinidir}/lower-constraints.txt
+  -r{toxinidir}/test-requirements.txt
+  -r{toxinidir}/requirements.txt
+  -egit+https://git.openstack.org/openstack/ceilometer#egg=ceilometer
+  -rhttps://git.openstack.org/cgit/openstack/ceilometer/plain/test-requirements.txt