remove job settings for tacker repositories

This is a mechanically generated patch to remove the job settings that
have been migrated to the git repositories owned by the tacker team.

See the python3-first goal document for details:
https://governance.openstack.org/tc/goals/stein/python3-first.html

Change-Id: I349838571fa30070c0174a663799854c014cc932
Story: #2002586
Task: #24324

zuul.d/projects.yaml

@@ -10850,11 +10850,6 @@
 - project:
     name: openstack/python-tackerclient
     templates:
-      - openstack-python-jobs
-      - openstack-python35-jobs-nonvoting
-      - check-requirements
-      - publish-openstack-sphinx-docs
-      - release-notes-jobs
       - publish-to-pypi
 
 - project:
@@ -11640,35 +11635,15 @@
 - project:
     name: openstack/tacker
     templates:
-      - check-requirements
-      - openstack-python-jobs
-      - publish-openstack-sphinx-docs
-      - release-notes-jobs
       - translation-jobs-master-stable
-      - openstack-python35-jobs
       - api-ref-jobs
       - publish-to-pypi
 
 - project:
     name: openstack/tacker-horizon
     templates:
-      - check-requirements
-      - openstack-python-jobs
-      - openstack-python35-jobs
-      - publish-openstack-sphinx-docs
       - publish-to-pypi-horizon
 
-- project:
-    name: openstack/tacker-specs
-    templates:
-      - openstack-specs-jobs
-    check:
-      jobs:
-        - openstack-tox-pep8
-    gate:
-      jobs:
-        - openstack-tox-pep8
-
 - project:
     name: openstack/tap-as-a-service
     templates: