Add API to set a seed value for UUID generation,

Add API to set a seed value for UUID generation,
to ensure that a device always uses the same UUID.
If the seed value is not set, a UUID is generated randomly.

Patch #1 : Initial upload
Patch #2 : add header file include on srmutility.c.
Patch #3 : Updated according to comments.
Patch #4 : Fix build error
Patch #5 : rebase
Patch #6 : Fix coredump
Patch #7-8 : Retrigger
Patch #9-10 : Updated according to comments.
Patch #11-13 : Retrigger

Change-Id: I6ce668866b5881386a52ef8cb9de5226b8595749
Signed-off-by: Chul Lee <chuls.lee@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/16259
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Kevin Kane <kkane@microsoft.com>
Reviewed-by: Joonghwan Lee <jh05.lee@samsung.com>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/16921
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Phil Coval <philippe.coval@osg.samsung.com>