test: fix test script

scripts/test/start-two-nodes-in-docker.sh

@@ -8,7 +8,7 @@ set -euo pipefail
 ## this is why a docker network is created, and the containers's names have a dot.
 
 # ensure dir
-cd -P -- "$(dirname -- "$0")/.."
+cd -P -- "$(dirname -- "$0")/../../"
 
 IMAGE1="${1}"
 IMAGE2="${2:-${IMAGE1}}"
@@ -94,7 +94,7 @@ backend emqx_dashboard_back
     # Must use a consistent dispatch when EMQX is running on different versions
     # because the js files for the dashboard is chunked, having the backends sharing
     # load randomly will cause the browser fail to GET some chunks (or get bad chunks if names clash)
-    balance first
+    balance source
     mode http
     server emqx-1 $NODE1:18083
     server emqx-2 $NODE2:18083
@@ -146,7 +146,7 @@ wait_for_emqx() {
     container="$1"
     wait_limit="$2"
     wait_sec=0
-    while ! docker exec "$container" emqx_ctl status >/dev/null 2>&1; do
+    while ! docker exec "$container" emqx ctl status; do
         wait_sec=$(( wait_sec + 1 ))
         if [ $wait_sec -gt "$wait_limit" ]; then
             echo "timeout wait for EMQX"
@@ -182,4 +182,4 @@ wait_for_haproxy 10
 
 echo
 
-docker exec $NODE1 emqx_ctl cluster join "emqx@$NODE2"
+docker exec $NODE1 emqx ctl cluster join "emqx@$NODE2"