Added memory deallocation of Consumer main thread handle.

Added memory deallocation of Consumer main thread handle.

When consumer service stopped,
consumer thread handle should de-allocate at memory
because it was allocated the way of dynamic-allocation.

Thread handle is de-allocated on NSDestroyThreadHandle().

Change-Id: I01d773892c6f6d79b833036df8f078a4f6df0ce7
Signed-off-by: KIM JungYong <jyong2.kim@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/9831
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>