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: I483dbc92a787f4a3b0041bd398691b667dc40f3b
Depends-On: https://review.openstack.org/555034
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/.zuul.yaml b/.zuul.yaml
index bc0c71d..7e020cb 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -3,11 +3,13 @@
       jobs:
         - python-saharaclient-scenario
         - python-saharaclient-tempest
+        - openstack-tox-lower-constraints
     gate:
       jobs:
         - python-saharaclient-scenario
         - python-saharaclient-tempest
 
+        - openstack-tox-lower-constraints
 - job:
     name: python-saharaclient-scenario
     description: |