Remove zuul.d temporarily

Signed-off-by: Gael Chamoulaud (Strider) <gchamoul@redhat.com>

zuul.d/layout.yaml

@@ -1,14 +0,0 @@
-- project:
-    templates:
-    - tripleo-multinode-container-minimal
-    - openstack-python3-ussuri-jobs
-    - check-requirements
-    - release-notes-jobs-python3
-    check:
-      jobs:
-      - openstack-tox-linters
-      - openstack-tox-lower-constraints
-    gate:
-      jobs:
-      - openstack-tox-linters
-      - openstack-tox-lower-constraints