Added unit tests for StackResource

Added unit tests for StackResource

Unit test exercise code paths to check OCCreateResource() for
OC_LIENT mode and also to check if resource type name is invalid
i.e., null terminated or not.
This also includes the bug fix related to checking if resource type
name is invalid i.e., null terminated or not.

Change-Id: I7f8767a4e8b9586de9cb0926dd8a4afcd03b792c
Signed-off-by: Ravi Nanjundappa <nravi.n@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1391
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Joseph Morrow <joseph.l.morrow@intel.com>
Reviewed-by: Erich Keane <erich.keane@intel.com>