Update consumer logic for stopped provider.

Update consumer logic for stopped provider.

When the provider was stopped service,
consumer service will feedback to upperlayer on ProviderChangedCallback but non-feedback before.
This patch enable feedback when stopped provider service.

And enum value of NS_STOPPED is added.
NSResponse enum structure is renamed with NSProviderState.

Change-Id: I7fdd2ca1d3ba0b534c74b0fbc6719616daab2f67
Signed-off-by: KIM JungYong <jyong2.kim@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/11091
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>