[DCCP]: Generalize dccp_v4_send_reset

Renaming it to dccp_send_reset and moving it from the ipv4 specific
code to the core dccp code.

This fixes some bugs in IPV6 where timers would send v4 resets, etc.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc net/dccp/dccp.h
Simple merge

diff --cc net/dccp/input.c
Simple merge

diff --cc net/dccp/ipv4.c
Simple merge

diff --cc net/dccp/output.c
Simple merge

diff --cc net/dccp/timer.c
Simple merge