Merge pull request #9735 from jbradberry/update-docker-file-version

Update the versioning on the docker-compose template

SUMMARY
Some versions of docker-compose will break with the new addition of
name parameters without this.
ISSUE TYPE

Bugfix Pull Request

COMPONENT NAME

Installer

Reviewed-by: Shane McDonald <me@shanemcd.com>
Reviewed-by: Bianca Henderson <beeankha@gmail.com>
Reviewed-by: Christian Adams <rooftopcellist@gmail.com>

tools/docker-compose/ansible/roles/sources/templates/docker-compose.yml.j2

@@ -1,5 +1,5 @@
 ---
-version: '2'
+version: '2.1'
 services:
 {% for i in range(cluster_node_count|int) %}
   {% set container_postfix = loop.index %}