test: add local 2x2 route topology

e2e/common/qBittorrent.conf

@@ -0,0 +1,14 @@
+[LegalNotice]
+Accepted=true
+
+[Preferences]
+Downloads\SavePath=/downloads/
+WebUI\Address=*
+WebUI\AlternativeUIEnabled=false
+WebUI\AuthSubnetWhitelist=0.0.0.0/0
+WebUI\AuthSubnetWhitelistEnabled=true
+WebUI\CSRFProtection=false
+WebUI\HostHeaderValidation=false
+WebUI\Password_PBKDF2="@ByteArray(ARQ77eY1NUZaQsuDHbIMCA==:0WMRkYTUWVT9wVvdDtHAjU9b3b7uB8NR1Gur2hmQCvCDpm39Q+PsJRJPaCU51dEiz+dTzh8qbPsL8WkFljQYFQ==)"
+WebUI\Port=8080
+WebUI\Username=admin

e2e/common/start-syncthing.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+set -eu
+
+home=/var/syncthing
+api_key=$(cat /run/secrets/syncthing_api_key)
+
+if [ ! -f "$home/config.xml" ]; then
+    syncthing generate --home="$home" --no-port-probing
+fi
+
+exec syncthing serve \
+    --home="$home" \
+    --gui-address=http://0.0.0.0:8384 \
+    --gui-apikey="$api_key" \
+    --no-browser \
+    --no-port-probing \
+    --no-restart \
+    --no-upgrade
+