Documents shouldn't be uploaded to server when sync is suspended

Steps to reproduce:

1. Suspend synchronization on one of the Drive local accounts (I have 2 users, that synced different foldes).
2. D&D a file in the suspended-sync folder.
   => The file is created on the server although synchronization is suspended from client side.

It looks like suspension is respected when I create new files on the server: they are not added to my Nuxeo Drive folder.