Adaptations to docker-compose V2

Test env now supports both docker-compose V1 and V2

Issue-ID: NONRTRIC-618

Signed-off-by: BjornMagnussonXA <bjorn.magnusson@est.tech>
Change-Id: I6a5717b6dce64086123cc5575ef45f9e299cd7e3
diff --git a/test/simulator-group/sdnc/docker-compose.yml b/test/simulator-group/sdnc/docker-compose.yml
index 0b6f357..505a54c 100644
--- a/test/simulator-group/sdnc/docker-compose.yml
+++ b/test/simulator-group/sdnc/docker-compose.yml
@@ -17,9 +17,8 @@
 
 networks:
   default:
-    external:
-      name: ${DOCKER_SIM_NWNAME}
-
+    external: true
+    name: ${DOCKER_SIM_NWNAME}
 services:
   db:
     image: ${SDNC_DB_IMAGE}