move cloudron network creation to platform code

this gives us more control on re-creating the network with different
arguments/options when needed.

src/cloudron.js

@@ -34,6 +34,7 @@ const apps = require('./apps.js'),
     debug = require('debug')('box:cloudron'),
     delay = require('delay'),
     dns = require('./dns.js'),
+    dockerProxy = require('./dockerproxy.js'),
     domains = require('./domains.js'),
     eventlog = require('./eventlog.js'),
     fs = require('fs'),
@@ -63,6 +64,7 @@ async function initialize() {
 
 async function uninitialize() {
     await cron.stopJobs();
+    await dockerProxy.stop();
     await platform.stopAllTasks();
 }
 
@@ -76,6 +78,7 @@ async function onActivated(options) {
     // 2. the restore code path can run without sudo (since mail/ is non-root)
     await platform.start(options);
     await cron.startJobs();
+    await dockerProxy.start(); // this relies on the 'cloudron' docker network interface to be available
 
     // disable responding to api calls via IP to not leak domain info. this is carefully placed as the last item, so it buys
     // the UI some time to query the dashboard domain in the restore code path