[SSM] Fix IOT-332, 333, 334 issues

[SSM] Fix IOT-332, 333, 334 issues

Modify SSM java Interface and Android sample app

1. Fix IOT 332, unregister queries continuously

2. Fix IOT 333, handling exception when registering an empty query

3. Fix IOT 334, handling exception when registering invalid queries

Change-Id: Ie4bb94c19634c18f6484313de16a49c1ac5f46d1
Signed-off-by: Minji Park <minjii.park@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/418
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>