From: Cong Wang <redacted>
Date: Wed,  5 Dec 2012 15:19:51 +0800

V3: make it a flag
V2: make the toggle per-port

Fast leave allows bridge to immediately stops the multicast
traffic on the port receives IGMP Leave when IGMP snooping is enabled,
no timeouts are observed.

Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Stephen Hemminger <redacted>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Cong Wang <redacted>

Applied.