Remove tripleo-multinode-container|baremetal-minimal from layout

The tripleo-multinode-container-minimal and -baremetal-minimal
templates are being deprecated [1] as part of wider tripleo CI
optimization at [2].

[1] Ie6473759383bd4b903cbe56fba9fee75a24154c4
[2] https://review.opendev.org/q/topic:tripleo-ci-reduce

Change-Id: I9bd3b482492cb59d247193de71377611317b76b8

zuul.d/layout.yaml

@@ -1,7 +1,5 @@
 - project:
     templates:
-      - tripleo-multinode-baremetal-minimal
-      - tripleo-multinode-container-minimal
       - check-requirements
       - openstack-python-jobs
       - openstack-python35-jobs