Adds conditional skip excludes in containers build for rocky

The excludes list is needed for f28 containers build. For the
rocky periodic we need to skip it as there is no such parameter
in the container build there.

Instead uses sed to remove excludes from containers list.
Once we cherrypick that [1] we can remove sed and use --excludes.

Test runs in [2]

[1] https://review.openstack.org/#/q/topic:cherrypick-excludes-containers-build
[2] https://review.rdoproject.org/r/#/c/19533/
Co-Authored-By: Sagi Shnaidman <sshnaidm@redhat.com>
Change-Id: I668a8557165972324e11707c2f3f32199658b6b9

playbooks/tripleo-buildcontainers/templates/build.sh.j2

@@ -2,12 +2,20 @@
 source {{ workspace }}/venv/bin/activate
 TRIPLEO_COMMON_PATH="{{ openstack_git_root }}/tripleo-common"
 
+{% if zuul.branch == 'stable/rocky' %}
+    {% for item in exclude_containers['rocky'] %}
+sed -i "/{{ item }}/,+1 d" $TRIPLEO_COMMON_PATH/container-images/overcloud_containers.yaml
+    {% endfor %}
+{% endif %}
+
 openstack overcloud container image build \
     --config-file $TRIPLEO_COMMON_PATH/container-images/overcloud_containers.yaml \
     --kolla-config-file {{ workspace }}/kolla-build.conf \
+    {% if zuul.branch != 'stable/rocky' %}
     {% for item in exclude_containers[ansible_pkg_mgr] %}
         --exclude {{ item }} \
     {% endfor %}
+    {% endif %}
     {% if use_buildah is defined and use_buildah %}
         --use-buildah \
     {% endif %}

playbooks/tripleo-buildcontainers/vars/common.yaml

@@ -18,6 +18,8 @@ exclude_containers:
     - sensu-base
   yum:
     - opendaylight
+  rocky:
+    - grafana
 
 timestamper_cmd: >-
     | awk '{ print strftime("%Y-%m-%d %H:%M:%S |"), $0; fflush(); }'