fix: launch opensearch container without SSL

Leaving security on in devstack results in openseach freaking out as
it fails to get its TLS running. With this change OS is running
and usable.

docker-compose.yml

@@ -86,6 +86,7 @@ services:
       - discovery.type=single-node
       - bootstrap.memory_lock=true
       - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
+      - "plugins.security.disabled=true"
 
   firefox:
     container_name: "edx.${COMPOSE_PROJECT_NAME:-devstack}.firefox"