gatt-database: Add OCF service handling logic

gatt-database: Add OCF service handling logic

1. invalid handle issue
For bluez, the handle increases whenever service is added.
Invalid handle error occurs because mobile caches the handle for paired remote
device. Modify to use reserved handle for ocf uuid.

2. service persistence issue
Mobile is caching without service if gatt connection is lost while service is
removed.
Modify service changed notification not to be delivered for ocf service.

Change-Id: Ie77a21a7828251dbfd42a9b8749188c4696a819b
Signed-off-by: Wootak Jung <wootak.jung@samsung.com>