move tasks to separate directory

these are just wrappers that we use to launch as processes

src/backups.js

@@ -945,7 +945,7 @@ function startBackupTask(auditSource, callback) {
 
     // when parent process dies, this process is killed because KillMode=control-group in systemd unit file
     assert.strictEqual(gBackupTask, null);
-    gBackupTask = child_process.fork(__dirname + '/backuptask.js', [ JSON.stringify(auditSource) ], { stdio: [ 'pipe', fd, fd, 'ipc' ]});
+    gBackupTask = child_process.fork(__dirname + '/tasks/backuptask.js', [ JSON.stringify(auditSource) ], { stdio: [ 'pipe', fd, fd, 'ipc' ]});
     gBackupTask.once('exit', function (code, signal) {
         debug(`startBackupTask: completed with code ${code} and signal ${signal}`);
 

src/tasks/backuptask.js

@@ -8,10 +8,10 @@
 require('supererror')({ splatchError: true });
 
 var assert = require('assert'),
-    backups = require('./backups.js'),
-    database = require('./database.js'),
-    debug = require('debug')('box:backupupload'),
-    paths = require('./paths.js'),
+    backups = require('../backups.js'),
+    database = require('../database.js'),
+    debug = require('debug')('box:backuptask'),
+    paths = require('../paths.js'),
     safe = require('safetydance');
 
 function initialize(callback) {