resource-container: add return of status code for registerResource() also to JAVA API

resource-container: add return of status code for registerResource() also to JAVA API

This forwards the return code of the registerResource() function also to the
JAVA API, so java application can also make use of it.

This is an extension to commit b449dcc5e7 "resource-container: make
registerResource() return status code"

Change-Id: Icdb71447486ea77b8ea1ef4f0b2f645c9ffbf6d2
Signed-off-by: Hauke Mehrtens <hauke.mehrtens@lantiq.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/4305
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Markus Jung <markus.jung85@gmail.com>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>