fold sysinfo into network

the backends are network backends

src/test/network-test.js

@@ -122,6 +122,10 @@ describe('Network', function () {
             const config = await network.getIPv6Config();
             expect(config.provider).to.be('generic');
         });
+
+        it('test machine has IPv6 support', function () {
+            expect(network.hasIPv6()).to.equal(true);
+        });
     });
 
     describe('Dynamic DNS', function () {

src/test/sysinfo-test.js

@@ -1,13 +0,0 @@
-/* global it:false */
-/* global describe:false */
-
-'use strict';
-
-const expect = require('expect.js'),
-    sysinfo = require('../sysinfo.js');
-
-describe('config', function () {
-    it('test machine has IPv6 support', function () {
-        expect(sysinfo.hasIPv6()).to.equal(true);
-    });
-});