Bluetooth: Adapterservice Cleanup and unbind conditionally

Issue: When stack cleanup is done in Bluetooth state other
than Off, it causes random Bluetooth shutdown and sometimes
crashes because of cleanup in-between operations.

Cause: Due to very quick on-off sequence during automation
testing, next turn on is queued immediately after turn off
before cleanup can be processes. This causes cleanup to
occur later on causing the issue.

Measure: Added condition to make sure that cleanup and
unbind happens only when Bluetooth is Off.

CRs-fixed: 1045491

Change-Id: Ida3b3c12a97604919fbab6d7f4f34b9daa93d85a