ktrace: Record socket violations with KTR_CAPFAIL

Report restricted access to socket addresses and protocols while
Capsicum violation tracing with CAPFAIL_ADDR and CAPFAIL_PROTO.

Reviewed by: markj
Approved by: markj (mentor)
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D40681

(cherry picked from commit aa32d7cbc92c818622462635641d240ae4342eb2)