- When reconfiguring protocol on a lagg, first set it to LAGG_PROTO_NONE,
  then drop lock, run the attach routines, and then set it to specific
  proto. This removes tons of WITNESS warnings.
- Make lagg protocol attach handlers not failing and allocate memory
  with M_WAITOK.

Sponsored by:	Netflix
Sponsored by:	Nginx, Inc.
xen: add proper copyright attribution

Noted by:	jmallett
Fix typos.
Fix the size of AT91SAM9260_PIT_SIZE.
Add very basic outline man page for smsc(4).

MFC after:	6 days