implement Android sample App for mediator.

implement Android sample App for mediator.

 Follow the below steps.
 1. Discover an enrollee in a network (e.g. Soft AP network)
 2. Do Security provisioning (if needed)
 3. Get a device default property
 4. Do WiFi and device configuration provisioning
 5. Discover an enrollee again and do cloud server provisioning

Change-Id: I1c1dde47b4b73aa4a6eacc6dc1a354e4a72911ce
Signed-off-by: Heewon Park <h_w.park@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/9247
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>