Dropping lower-constraints job

We decided to drop lower-constraints jobs in the Octavia projects on
stable branches. They consumes too much time to get them updated.
We're still maintaining those jobs on master branches.

Change-Id: Ibc39478ab220d014264f066db041d7d2e28cb7b1

lower-constraints.txt

@@ -1,54 +0,0 @@
-asn1crypto==0.23.0
-bandit==1.4.0
-cffi==1.14.0
-cliff==2.8.0
-coverage==4.0
-cryptography==3.0
-decorator==3.4.0
-deprecation==1.0
-doc8==0.6.0
-dogpile.cache==0.6.2
-extras==1.0.0
-fixtures==3.0.0
-idna==2.6
-jmespath==0.9.0
-jsonpatch==1.16
-jsonpointer==1.13
-jsonschema==2.6.0
-keystoneauth1==3.4.0
-linecache2==1.0.0
-mccabe==0.2.1
-msgpack-python==0.4.0
-munch==2.1.0
-netifaces==0.10.4
-openstacksdk==0.11.2
-os-service-types==1.2.0
-osc-lib==1.14.1
-oslo.config==5.2.0
-oslo.serialization==2.18.0
-oslo.utils==3.33.0
-oslotest==3.2.0
-pbr==2.0.0
-positional==1.2.1
-pycparser==2.18
-Pygments==2.2.0
-pylint==1.9.2
-pyOpenSSL==19.1.0
-pyperclip==1.5.27
-python-cinderclient==3.3.0
-python-glanceclient==2.8.0
-python-keystoneclient==3.8.0
-python-mimeparse==1.6.0
-python-neutronclient==6.7.0
-python-novaclient==9.1.0
-python-openstackclient==3.12.0
-python-subunit==1.0.0
-requests==2.14.2
-requests-mock==1.2.0
-rfc3986==0.3.1
-stestr==2.0.0
-testscenarios==0.4
-testtools==2.2.0
-traceback2==1.4.0
-unittest2==1.1.0
-warlock==1.2.0

tox.ini

@@ -132,12 +132,6 @@ extension =
 paths =
   ./octaviaclient/hacking
 
-[testenv:lower-constraints]
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt
-
 [testenv:requirements]
 deps =
   -egit+https://opendev.org/openstack/requirements#egg=openstack-requirements

zuul.d/projects.yaml

@@ -2,7 +2,6 @@
     templates:
       - check-requirements
       - openstack-cover-jobs
-      - openstack-lower-constraints-jobs
       - openstack-python3-victoria-jobs
       - openstackclient-plugin-jobs
       - publish-openstack-docs-pti