Java API Project for Simulator.

Java API Project for Simulator.

It includes the following changes:
    1. Updating existing service provider implementation that includes removal
       of unused SimulatorManagerCallback class, and inclusion of Javadoc
       comments.
    2. Implementation of client controller Java APIs.
    3. Changing the project's package structure to include both service
       provider and client controller related java files in the same project.
       Service provider and client controller files are segregated in
       different packages and there is a common package containing all common
       files.
    4. Updating the interface for log.

Change-Id: Ib8bf99d8f0de1e0c28e95a43c64447fe112f0eeb
Signed-off-by: G S Senthil Kumar <senthil.gs@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/2138
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>