Removing obsolete version attribute in docker-compose.yaml

Change-Id: I17acaed361de65f98d2ebed5dec456186717a78a
(cherry picked from commit c7480d3bcb61ce91b9f021e3caf43383d12bf1ba)

src/test/docker/docker-compose.yaml

diff --git a/src/test/docker/docker-compose.yaml b/src/test/docker/docker-compose.yaml
index f744d2e..8a4eda8 100644
--- a/src/test/docker/docker-compose.yaml
+++ b/src/test/docker/docker-compose.yaml
@@ -1,5 +1,3 @@
-version: '3'
-
 services:
 
   nfs-server: