[IOT-1599] fix message publish in MQ

[IOT-1599] fix message publish in MQ

removed logic for checking 'message' property
https://jira.iotivity.org/browse/IOT-1599

Change-Id: I1edc3eb68d97156ce3befe44205e2d1ff6006b7c
Signed-off-by: Jung Seungho <shonest.jung@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/14715
Reviewed-by: Uze Choi <uzchoi@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jee Hyeok Kim <jihyeok13.kim@samsung.com>
(cherry picked from commit 647b538360333cdf408eba9e4a62b37dfef1cc71)
Reviewed-on: https://gerrit.iotivity.org/gerrit/14725