hs-test: restrict concurrency on envoy

Type: test

Signed-off-by: Filip Tehlar <ftehlar@cisco.com>
Change-Id: I8b06f4554a6ee5b13de829e47eaa82431a76c332
diff --git a/extras/hs-test/topo-containers/ns.yaml b/extras/hs-test/topo-containers/ns.yaml
index bdba560..e472531 100644
--- a/extras/hs-test/topo-containers/ns.yaml
+++ b/extras/hs-test/topo-containers/ns.yaml
@@ -25,4 +25,5 @@
       - name: "VCL_CONFIG"
         value: "/tmp/vcl.conf"
     image: "envoyproxy/envoy-contrib:v1.21-latest"
+    extra-args: "--concurrency 2 -c /etc/envoy/envoy.yaml"
     is-optional: true