provision: add route to detect ipv4 and ipv6

src/network.js

@@ -18,7 +18,8 @@ exports = module.exports = {
 
     getIPv4,
     hasIPv6,
-    getIPv6
+    getIPv6,
+    detectIP
 };
 
 const assert = require('assert'),
@@ -162,3 +163,15 @@ async function getIPv6() {
     if (!result) return null;
     return ipaddr.parse(result).toRFC5952String();
 }
+
+async function detectIP() {
+    const genericProvider = require('./network/generic.js');
+
+    const [error4, ipv4] = await safe(genericProvider.getIPv4({}));
+    const [error6, ipv6] = await safe(genericProvider.getIPv6({}));
+
+    return {
+        ipv4: error4 ? null : ipv4,
+        ipv6: error6 ? null : ipv6
+    };
+}