[Tizen_Sync] Script update

- Upgrade script for "eurogiciel" remote automatic addition
- Add subversion presence before launching gclient

Change-Id: I15697a1289db95831e47ef5a1a2f8f21d34ef338
Signed-off-by: Yannick GICQUEL <yannick.gicquel@open.eurogiciel.org>