Set ICU default locale to en_US and when locale changes

 - Set default ICU locale to en_US when initiated
 - If locale changes, change the default ICU locale to new locale

Fixes:
   [GF-7071] locale is not being properly set in DB8...
   [GF-5232] "MojDbQuota" test is failing...
   [GF-5236] "MojDbTextCollator" test is failing...
   [GF-5235] "MojDbSearch" test is failing...

Open-webOS-DCO-1.0-Signed-off-by: Maksym Sditanov <msditanov@luxoft.com>
Open-webOS-DCO-1.0-Signed-off-by: Roger Stringer <roger.stringer@lge.com>

Change-Id: I8dc5fca98af04eaca69f25d744ed9ec8bd0f18f1
Reviewed-on: https://g2g.palm.com/2771
Reviewed-by: Build Verification
Tested-by: Roger Stringer <roger.stringer@lge.com>
Reviewed-by: Eric Blade <eric.blade@lge.com>
Reviewed-by: Alan Levi <alan.levi@lge.com>
Reviewed-by: Roger Stringer <roger.stringer@lge.com>