Start showing recently binded current client's external window if there has been...

Start showing recently binded current client's external window if there has been connectetd external outpout

changes:
1. send EOM's attribute and attribute_status states in 'info' event on
connection and disconnection of an external output. It was necessary
because events on clients side are handled in wron way.
2. Send ACTIVE and INACTIVE events to 'current' client if external
output has been connected or disconnected.

Change-Id: Iae4e6396fd71ac911c8b9938756967362c44fd2e
Signed-off-by: Roman Peresipkyn <r.peresipkyn@samsung.com>