[Convergence] Fixed Payload types and new-instance issue

[Convergence] Fixed Payload types and new-instance issue

[Features] Removed Payload as exported objects types
  When creating new instance, ConvergenceManager object could hold
  reference to previous one, this is fixed by reseting manager object.

[Verification] Running test AppCommunicationService_getClientList multiple times is
  now possible. Before change second run blocks cause of bad ConvergenceInstance reference.

Change-Id: If703172fee8a5342680e314bd5a443c14c7c2108
Signed-off-by: Piotr Kosko <p.kosko@samsung.com>