Unlock getsockopt(2) and setsockopt(2). Unlock them both because at

Unlock getsockopt(2) and setsockopt(2). Unlock them both because at
protocol layer they follow the same (*pr_ctloutput)() handlers.

At sockets layer we touch only per-socket data, which is solock()
protected.

At protocol layer, udp(4), unix(4) and key management sockets have no
(*pr_ctloutput)() handlers. route_ctloutput() touches only per socket
data, which is solock() protected. inet{,6} globals are protected by
netlock, which is solock() backend for corresponding sockets.

ok bluhm@