Removing Internal calls to CA APIs in OCPlatform

Removing Internal calls to CA APIs in OCPlatform

Previously on the CA branch, we had APIs calling the CA APIs internally
with hard coded connectivity types.
Made changes in "service" project to enable using "#ifdef CA_INT" and
added the same in appropriate places.

Change-Id: Ie9f9faf9b7fa90556b4633528b0fa60de9df451c
Signed-off-by: omkar <omkar.m.hegde@intel.com>
Signed-off-by: Sudarshan Prasad <sudarshan.prasad@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/154
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Sashi Penta <sashi.kumar.penta@intel.com>
Reviewed-by: Yuliya Kamatkova <yuliya.kamatkova@intel.com>