Move docker proxy into its own file

src/platform.js

@@ -14,7 +14,6 @@ var apps = require('./apps.js'),
     debug = require('debug')('box:platform'),
     fs = require('fs'),
     hat = require('./hat.js'),
-    http = require('http'),
     infra = require('./infra_version.js'),
     locker = require('./locker.js'),
     mail = require('./mail.js'),
@@ -316,35 +315,6 @@ function startApps(existingInfra, callback) {
     }
 }
 
-function startDockerProxy(callback) {
-    assert.strictEqual(typeof callback, 'function');
-
-    function interceptor(req, res) {
-        debug(`dockerInterceptor: ${req.method} ${req.url}`);
-        return false;
-    }
-
-    return http.createServer(function (req, res) {
-        if (interceptor(req, res)) return;
-
-        // rejectUnauthorized should not be required but it doesn't work without it
-        var options = _.extend({ }, { socketPath: '/var/run/docker.sock' }, { method: req.method, path: req.url, headers: req.headers, rejectUnauthorized: false });
-        var dockerRequest = http.request(options, function (dockerResponse) {
-            res.writeHead(dockerResponse.statusCode, dockerResponse.headers);
-            dockerResponse.on('error', console.error);
-            dockerResponse.pipe(res, { end: true });
-        });
-
-        req.on('error', console.error);
-        if (!req.readable) {
-            dockerRequest.end();
-        } else {
-            req.pipe(dockerRequest, { end: true });
-        }
-
-    }).listen(config.get('dockerProxyPort'), callback);
-}
-
 function handleCertChanged(cn) {
     assert.strictEqual(typeof cn, 'string');