[DCCP]: Introduce CCID getsockopt for the CCIDs

Allocation for the optnames is similar to the DCCP options, with a
range for rx and tx half connection CCIDs.

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

diff --cc include/linux/dccp.h
Simple merge

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

diff --cc net/dccp/ccids/ccid3.c
Simple merge

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