IOT-1583: Removing boost usage from stack sample.

IOT-1583: Removing boost usage from stack sample.

There is no need to have an additional dependency on boost
for the sake of this sample.

Change-Id: I4bc65730aebb62f5b3d0e9edc0ff9ff8ae16a7e2
Signed-off-by: Pawel Winogrodzki <pawelwi@microsoft.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/18307
Reviewed-by: Alex Kelley <alexke@microsoft.com>
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Mike Fenelon <mike.fenelon@microsoft.com>
Reviewed-by: Dan Mihai <Daniel.Mihai@microsoft.com>