Updated sturcture of consumer.

Updated sturcture of consumer.

Task type about discover protocol is added.
NSMessage_consumer and messageId in NSMessage is updated.
messageId in NSMessage handling logic is modified to cause changed variable type.

Change-Id: I6454227f40c3406516932eca0ed6d8fb3b6e0e9a
Signed-off-by: KIM JungYong <jyong2.kim@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/8611
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>
Tested-by: Uze Choi <uzchoi@samsung.com>