IoT-243 Connectivity Abstraction single-threaded module missing definition for CASend...

IoT-243 Connectivity Abstraction single-threaded module missing definition for CASendRequestToAll().

IoT-161 PCF Command is not used in OIC_LOG() calls under the connectivity directory.

Updated documentation and few memory leaks .

Change-Id: I10db0f4e2c50cbe1ace726a0577905ea52afcf3f
Signed-off-by: Ashok Channa <ashok.channa@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/142
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Sudarshan Prasad <sudarshan.prasad@intel.com>