modified BLE scanning logic to stop while is connecting.

modified BLE scanning logic to stop while is connecting.

since connection lead time have improved in stop scan state.
BLE scan should be stopped while is connecting.

Change-Id: Iefcb37c7c366efecc22ae9014615a3795ba0fdaa
Signed-off-by: jihwan.seo <jihwan.seo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/13871
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>
Signed-off-by: jihwan.seo <jihwan.seo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/14293