settings: move ipv6/ipv4 config into network

this also rename sysinfo_config to ipv4_config

src/test/network-test.js

@@ -110,6 +110,20 @@ describe('Network', function () {
         });
     });
 
+    describe('IPv6 config', function () {
+        it('can get default IPv6 setting', async function () {
+            const config = await network.getIPv6Config();
+            expect(config.provider).to.be('noop');
+        });
+
+        it('can set IPv6 setting', async function () {
+            await network.setIPv6Config({ provider: 'generic' });
+
+            const config = await network.getIPv6Config();
+            expect(config.provider).to.be('generic');
+        });
+    });
+
     describe('Dynamic DNS', function () {
         it('can get default dyndns', async function () {
             expect(await network.getDynamicDns()).to.be(false);