Add unittests for ConstructResourceTest for invalid host values

Add unittests for ConstructResourceTest for invalid host values

Added a test case for ConstructResourceTest to simulate the scenario of
Resource creation with host
* not having the ip or device address and
* not having the "coap://" protocol prefix.

Change-Id: Ic3f1b250950ad2c3a251a56a85e7356c06ac34fb
Signed-off-by: Ravi Nanjundappa <nravi.n@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/2154
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Erich Keane <erich.keane@intel.com>