Improve woble connection close
Improve woble connection close

In openweave, when application call device manager Close, which would send unsubscribe request to peripheral, and start the unsubscribe timer, after it receive unsubscribe confirm or timeout happens, openweave would close ble endpoint's connection.
App don't know when the ble connection goes away when using above async Close and use delay/retry to alleviate this issue, but failure may still happen, so we force close ble endpoint no matter whether we receive unsubscribe confirm or not.

openweave/openweave-core,openweave/openweave-core,openweave/openweave-core,openweave/openweave-core,openweave/openweave-core,openweave/openweave-core