hs-test: use relative paths for docker volumes

Type: test

Change-Id: I9d5c15662e50ceea08d2ccc653db36c5e3df869e
Signed-off-by: Filip Tehlar <ftehlar@cisco.com>
diff --git a/extras/hs-test/topo-containers/ns.yaml b/extras/hs-test/topo-containers/ns.yaml
index 2b1902b..2298ad2 100644
--- a/extras/hs-test/topo-containers/ns.yaml
+++ b/extras/hs-test/topo-containers/ns.yaml
@@ -1,7 +1,7 @@
 ---
 volumes:
   - volume: &shared-vol
-      host-dir: /tmp/shared-vol
+      host-dir: "$HST_VOLUME_DIR/shared-vol"
 
 # $HST_DIR will be replaced during runtime by path to hs-test directory
 containers: