[filebrowser] Issue with fileupload when Large Files are uploaded

Problem statement : When i am trying to upload an large file ( say 200mb) the fileuploader cancels the REST call of upload after 30 seconds which causes the upload to fail and .tmp file exists in the Place + the Dropzone Dialog box doesn't seems to disappear.

attached screenshot : 

Analysis : Currently Hue Uses Dropzonejs Opensource library for Drag and Drop and its default configured timeout value is 30 seconds : https://www.dropzonejs.com/#config-timeout

this value is configurable, so we need to increase this timeout to say 5 minutes.

Proposed fix increases the timeout to 5 minutes for Drag and Drop Operation to finish the upload.