Include RCS client module in Resource Container.

Include RCS client module in Resource Container.

Soft-sensor using resource-container needs client functionality.
but it is not supported on resource-container.
so, resource container includes the RCS-client-module, and enable to use client-function at soft-sensor.

This commit is initial version for resource container including client module.

Update discover logic,
and prevent multiple access to callback function.

Signed-off-by: jyong2.kim <jyong2.kim@samsung.com>
Change-Id: I3ba81ed185b82ee05a95de493a6ff560838e1054
Reviewed-on: https://gerrit.iotivity.org/gerrit/2388
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>