[IOT-2221] Add OCResource.setHost API to Java API

[IOT-2221] Add OCResource.setHost API to Java API

In addition to adding the setHost method the documentation
for the findResource was updated to reflect the same
documentation change made to the C++ findResource code to
account for the getAllHosts/setHost methods.

Bug: https://jira.iotivity.org/browse/IOT-2221
Change-Id: Ib33c122bced1832b2298c4701d0406f83ba63aaa
Signed-off-by: George Nash <george.nash@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/19729
Reviewed-by: Larry Sachs <larry.j.sachs@intel.com>
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Rick Bell <richard.s.bell@intel.com>