GitLab

When built with build option SECURED=0 some functions
are no longer used due to preprocessor macros.

The functions WithinBounds and IsEmptyCred were moved
within the
if defined(__WITH_DTLS__) || defined(__WITH_TLS__)
macro

Bug: https://jira.iotivity.org/browse/IOT-2539
Change-Id: I9c0e3fa57dee5531bd9661216f2b5160fb002f33
Signed-off-by: George Nash <george.nash@intel.com>