Implement bluetooth API based on Tizen bluetooth stack

BUG=XWALK-1065

Signed-off-by: Corentin Lecouvey <corentin.lecouvey@open.eurogiciel.org>
bt_initialize() is a Tizen C API. I don't see the benefit of initializing Tizen bluetooth stack if it is not used... Actually it is just use to enable/disable adapter but it is also possible to do it using Bluez DBus API. So In my opinion it was not consistent and so I removed it.