Added workaround to enable security in CA branch

Added workaround to enable security in CA branch

Currently there is a disconnect in the data structure used between RI
layer and CA layer to convey DTLS PSK credentials. We cannot update this
data structure in CA layer until all reviews of CA layer is completed.
This inhibits security testing of CA branch. Adding this workaround until
an update happens in CA layer to use common data structure.

Change-Id: Ieb17043c6ab3a32961133c5e009f5c06d968979f
Signed-off-by: Sachin Agrawal <sachin.agrawal@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/369
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Sakthivel Samidurai <sakthivel.samidurai@intel.com>
Reviewed-by: Sudarshan Prasad <sudarshan.prasad@intel.com>