Wiki for HA and correction in rfproxy source.

A new wiki explaining new high availability module having description of
the module and architectural view of the application after incorporating
the new changes. Also corrects the rfproxys source address to the fork
in routeflow organization .

Signed-off-by: Srijan Mishra <srijan23mishra@gmail.com>
Acked-by: Allan Vidal <allanv@cpqd.com.br>