Add route to set/get sysinfo

src/sysinfo/network-interface.js

@@ -1,7 +1,8 @@
 'use strict';
 
 exports = module.exports = {
-    getServerIp: getServerIp
+    getServerIp,
+    testConfig
 };
 
 var assert = require('assert'),
@@ -23,3 +24,12 @@ function getServerIp(config, callback) {
 
     return callback(null, addresses[0]);
 }
+
+function testConfig(config, callback) {
+    assert.strictEqual(typeof config, 'object');
+    assert.strictEqual(typeof callback, 'function');
+
+    if (typeof config.ifname !== 'string') return callback(new BoxError(BoxError.BAD_FIELD, 'ifname is not a string'));
+
+    callback(null);
+}