Added API to obtain OCResourceObject from RCSRemoteResourceObject.

Added API to obtain OCResourceObject from RCSRemoteResourceObject.

Resource Encapsulation layer's RCSRemoteResourceObject class does not provide
all the operations (e.g. PUT, DELETE) that IoTivity base layer provides.

If application wants to invoke base layer API's directly, it needs to obtain
OCResoureObject. Obtaining this object is not possible without calling base
layer discovery. However, if application wants to use both RE layer and Base
layer there will be redundant discovery going on.

To avoid this problem, we added an API that returns OCResoureObject maintained
in RE layer. Using this object, application can call base layer APIs without
additional discovery.

Change-Id: I87757d70bd5df3463c3573831d7392e7b45c670a
Signed-off-by: Abhishek Pandey <abhi.siso@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/9551
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Hun-je Yeon <hunje.yeon@samsung.com>
Reviewed-by: Jay  Sharma <jay.sharma@samsung.com>
Reviewed-by: Junghyun Oh <junghyun.oh@samsung.com>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>