changed block-wise transfer logic to process non-confirmable message

changed block-wise transfer logic to process non-confirmable message

according to the block-wise transfer specification, block messages
should be transmitted with request-response pairs of information from
a resource representation. current block-wise transfer logic did not
handle non-confirmable message like a specification.

Change-Id: I6305bf14166720638c86eae8dc21aa5903f5b7f4
Signed-off-by: hyuna0213.jo <hyuna0213.jo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/5699
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>