ENYO-3061: cleanup, prefer `self` over `this` + nested `bind()`

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>
ENYO-3061: Git-ignore `node_modules/busboy`

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>
ENYO-3061, ENYO-3259: mutualize form-data between bdPhoneGap & fsLocal

This is a regression introduced by the (incomplete) refactoring done
in the context of ENYO-2935.  This commit mutualises more code & fix the
regression (at least it seems to).

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>
ENYO-3061, cleanup

remove:
- unused SimpleFormData (now integrated in ServiceBase)
- too verbose traces
- jshint issues
- (more) paranoid Zalgo avoidance

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