ENYO-1740, ENYO-1890: Dropbox, fix PUT of existing file
ENYO-1740, ENYO-1890: Dropbox, fix PUT of existing file

- unlike fsLocal, fsDropbox does not consider that file `foo/bar` is the
  same as `foo/bar/.`

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>

mcanthony/ares-project,enyojs/ares-project,mcanthony/ares-project,enyojs/ares-project,mcanthony/ares-project,enyojs/ares-project,enyojs/ares-project,mcanthony/ares-project,enyojs/ares-project,mcanthony/ares-project,mcanthony/ares-project