ENYO-1020: fix review comment (typo)

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>
ENYO-1020: fix bug introduced while addressing review comment

- Use `refreshFile`, not `refreshFileTree`

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>
ENYO-1020: address review comment (clarify)

- turn lambda function used in `async.waterfall` into local a nested one
  with a (hopefully descriptive) name `_prepareNewLocation`
- Use `refreshFile`, not `refreshFileTree`

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