Reduce Elasticsearch/OpenSearch heap size to 200m in ci-aio env

This should free up some memory, allowing us to use a smaller flavor.

Author: markgoddard

etc/kayobe/environments/ci-aio/kolla/globals.yml

@@ -13,8 +13,8 @@ docker_yum_baseurl: "{{ stackhpc_repo_docker_url }}"
 docker_yum_gpgkey: "https://download.docker.com/linux/centos/gpg"
 
 # Elasticsearch / OpenSearch memory tuning
-es_heap_size: 1g
-opensearch_heap_size: 1g
+es_heap_size: 200m
+opensearch_heap_size: 200m
 
 # Increase Grafana timeout
 grafana_start_first_node_retries: 20