Fix for IOT-1214: Incorrect use of tinyCBOR API in security code

Fix for IOT-1214: Incorrect use of tinyCBOR API in security code

mapSize is consistently larger than the actual size of doxmMap.
This results in an erroneous parse of the resulting payload wherein
the last key-value pair is truncated.

When creating containers, we must specify CborIndefiniteLength unless
we know the exact length the container.

Change-Id: I8beb6bc45ae41531e8a7528d9dbd254a27e14be9
Signed-off-by: Kishen Maloor <kishen.maloor@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/10455
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Dave Thaler <dthaler@microsoft.com>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>
Reviewed-by: Jaehong Jo <jaehong.jo@samsung.com>
Reviewed-by: Phil Coval <philippe.coval@osg.samsung.com>
Reviewed-by: Kevin Kane <kkane@microsoft.com>
Reviewed-by: Ziran Sun <ziran.sun@samsung.com>