Import dump: support importing a board that exist in the farm

Authored by SBisson on Feb 15 2017, 7:15 PM.

Description

Import dump: support importing a board that exist in the farm

When a board already exist, we generate new ids and
try to look users up with their global ids.

Bug: T154830
Change-Id: Ic493dc132dcf7dc0000d37115b22b0382346c815

Details