opensearch: remove example certs and securityadmin_demo.sh

Change-Id: Iceb16a5cf2ebc64effe30bbc9144144cdffebab0

Author: mnasiadka

docker/opensearch/opensearch/Dockerfile.j2

@@ -17,7 +17,9 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 ENV OPENSEARCH_INITIAL_ADMIN_PASSWORD="Kolla24OpenSearch"
 
 {{ macros.install_packages(opensearch_packages | customizable("packages")) }} \
-    && chown -R opensearch:opensearch /usr/share/opensearch
+    && chown -R opensearch:opensearch /usr/share/opensearch \
+    && rm -f /etc/opensearch/*.pem \
+    && rm -f /etc/opensearch/securityadmin_demo.sh
 
 COPY extend_start.sh /usr/local/bin/kolla_extend_start
 RUN chmod 755 /usr/local/bin/kolla_extend_start