[IOT-1829] findResourceList is not implemented in Java API

[IOT-1829] findResourceList is not implemented in Java API

Added jni calls to support new c sdk api to return a list of resources.

OcPlatform.java now has findResources() methods that take a
OnResourcesFoundListener as a callback which has a method for the
returned array of found resources.

Change-Id: Ia874294d0a73b35f7bd23b15d9c122df2622cfdc
Signed-off-by: Larry Sachs <larry.j.sachs@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/17713
Reviewed-by: George Nash <george.nash@intel.com>
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: jihwan seo <jihwan.seo@samsung.com>
Reviewed-by: Rick Bell <richard.s.bell@intel.com>