No logical code change in this pathc.
Only Style 9 changes for mrsas driver.

Reviewed by:	ambrisko
MFC after:	2 weeks
Sponsored by:	AVAGO Technologies
Add an ability to set dumpdev via loader(8) tunable.

MFC after:	3 weeks
Revert r156046. We support setting dumpdev via loader tunable again.
Also change default disk name to ada.

MFC after:	3 weeks
Implement software (mode page) and hardware (config) write protection.
Fix comment.

MFC after:	1 week
Ensure that the number of stream reported in srs_number_streams is
consistent with the amount of data provided in the SCTP_RESET_STREAMS
socket option.
Thanks to Peter Bostroem from Google for drawing my attention to
this part of the code.
Ensure that the list of streams sent in a stream reset parameter fits
in an mbuf-cluster.
Thanks to Peter Bostroem for drawing my attention to this part of the code.