fold sysinfo into network

the backends are network backends

src/network/interface.js

@@ -0,0 +1,41 @@
+'use strict';
+
+// -------------------------------------------
+//  This file just describes the interface
+//
+//  New backends can start from here
+// -------------------------------------------
+
+exports = module.exports = {
+    getIPv4,
+    getIPv6,
+    testIPv4Config,
+    testIPv6Config
+};
+
+const assert = require('assert'),
+    BoxError = require('../boxerror.js');
+
+async function getIPv4(config) {
+    assert.strictEqual(typeof config, 'object');
+
+    throw new BoxError(BoxError.NOT_IMPLEMENTED, 'getIPv4 is not implemented');
+}
+
+async function getIPv6(config) {
+    assert.strictEqual(typeof config, 'object');
+
+    throw new BoxError(BoxError.NOT_IMPLEMENTED, 'getIPv6 is not implemented');
+}
+
+async function testIPv4Config(config) {
+    assert.strictEqual(typeof config, 'object');
+
+    return null;
+}
+
+async function testIPv6Config(config) {
+    assert.strictEqual(typeof config, 'object');
+
+    return null;
+}