Change back docker version to 2

It never needed to get upgraded to version 3.

Issue-ID: POLICY-315
Change-Id: Ic1ccd72e16acce5815c0a6d0faef673a974dc73b
Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>
diff --git a/docker-compose.yml b/docker-compose.yml
index 6091dd9..96fd507 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,4 +1,4 @@
-version: '3'
+version: '2'
 networks:
   default:
     driver: bridge