Remove tripleo-build-containers-jobs template from zuul layout
Remove tripleo-build-containers-jobs template from zuul layout

This removes tripleo-build-containers-jobs as this only contains
centos-7 jobs [1] and they are being removed with [2].

[1] https://opendev.org/openstack/tripleo-ci/src/commit/15761b77d91ab3e398f6fa1d10d2f5da267b7931/zuul.d/build-containers.yaml#L119-L127
[2] I70d2e5dbe995bc8dfe06817d6460f3f2f3732e7e

Change-Id: Idcab9a34ae7b5f20702d9a616173dd25d3894751

openstack/python-tripleoclient