Feature/rtpengine locate by dns (#29)

* k8s: query dns for rtpengine endpoints

* use udp now in k8s

* catch error on rtpengine failure

* specify node version in gh actions

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
         with:
-          node-version: 12
+          node-version: 14.x
       - run: npm ci
       - run: npm run jslint
       - run: npm test

package.json

@@ -3,7 +3,7 @@
   "version": "v0.7.1",
   "main": "app.js",
   "engines": {
-    "node": ">= 8.10.0"
+    "node": ">= 12.0.0"
   },
   "keywords": [
     "sip",