give fileStreams a little bit more time before closing them

lib/storage/file.js

@@ -64,7 +64,7 @@ const destroyStream = function (stream) {
     try { stream.close(); } catch (err) { console.error(err); }
     setTimeout(function () {
         try { stream.destroy(); } catch (err) { console.error(err); }
-    }, 5000);
+    }, 15000);
 };
 
 const ensureStreamCloses = function (stream, id, ms) {
@@ -729,7 +729,7 @@ var getChannel = function (env, id, _callback) {
                 delete env.channels[id];
                 destroyStream(channel.writeStream, path);
                 //console.log("closing writestream");
-            }, 30000);
+            }, 120000);
             channel.delayClose();
             env.channels[id] = channel;
             done(void 0, channel);