Remove NSMessage Storage of consumer service.

Remove NSMessage Storage of consumer service.

NSMessage storage is removed reason by unnecessariness functionality.
But, for the prevent of duplicated message, messageId and NSSyncType need to store.
So, linked list of information for message sync state is added.

Change-Id: Iea80b20a4ca44d9b17b2d3f0746d1f33212d9a3e
Signed-off-by: KIM JungYong <jyong2.kim@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/11479
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Chihyun Cho <ch79.cho@samsung.com>
Reviewed-by: Uze Choi <uzchoi@samsung.com>