BUG-4672: BMP client reconnection not working

BUG-4672: BMP client reconnection not working

-get rid of protocol-framework's reconnect strategy
-introduce simple initial reconnection as suggested in
https://tools.ietf.org/html/draft-ietf-grow-bmp-15#section-3.2
-BMP session should go to "up" state once the connection is established (channel is active),
introduced "IDLE" state of a BMP session
-added commented sample of active client (monired router) configuration

Introduces "IDLE" state of a BMP session,
session goes up once the channel is active.

Change-Id: Ibd78fe708162a710fdcc20c614cc1d9c1be6eb95
Signed-off-by: Milos Fabian <milfabia@cisco.com>