Merge "Remove lower-constraints.txt"

.zuul.yaml

@@ -32,7 +32,6 @@
       - ^releasenotes/.*$
       - ^.*\.rst$
       - ^(test-|)requirements.txt$
-      - ^lower-constraints.txt$
       - ^setup.cfg$
 
 - job:
@@ -80,7 +79,6 @@
       - check-requirements
       - lib-forward-testing-python3
       - openstack-cover-jobs
-      - openstack-lower-constraints-jobs
       - openstack-python3-yoga-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3