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Phabric: D522
Reviewed by: jmmv
Approved by: jmmv (co-mentor)
Cleanup the ECN configuration handling and provide an SCTP socket
option for controlling ECN on future associations and get the
status on current associations.
A simialar pattern will be used for controlling SCTP extensions in
upcoming commits.
Don't assume that the framebuffer driver is using vt_fb_blank() when blanking
the screen during init.

MFC after:	1 week
Rewrite a loop in vm_map_wire() so that gcc doesn't think that the variable
"rv" is uninitialized.

Reported by:	bz
- Spelling corrections

Suggested by:	Garrett Cooper <yaneurabeya@gmail.com>
PR:		192101
cxgbe(4): Remove an unused version of t4_enable_vi.

MFC after:	2 weeks
Add missing comparisons to make list IDs in EXTENDED COPY per-initiator,
as they should be.  Wrap it into a function to not duplicate the code.

MFC after:	3 days
Fix some bugs in RECEIVE COPY STATUS data.

MFC after:	3 days
Plug EXTENDED COPY request data memory leak.

MFC after:	3 days
Fix a copy and paste error.

X-MFC with: 269436
Add support for the SCTP_PR_SUPPORTED socket option as specified in
http://tools.ietf.org/html/draft-ietf-tsvwg-sctp-prpolicies
Add also a sysctl controlling the default of the end-points.

MFC after: 1 week
Rework r269444 to work also for lists without IDs.

MFC after:	3 days
Add myself to committers-src.dot.
Better late than never :-)
Remove Giant acquisition from the mount and unmount pathes.

It could be claimed that two things were reasonable protected by
Giant.  One is vfsconf list links, which is converted to the new
dedicated sx vfsconf_sx.  Another is vfsconf.vfc_refcount, which is
now updated with atomics.

Note that vfc_refcount still has the same races now as it has under
the Giant, the unload of filesystem modules can happen while the
module is still in use.

Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
Do the iwn(4) panic reinitialisation under IWN_LOCK().

I've checked each of the functions being called and there's either a
_locked version or it's supposed to be called with IWN_LOCK() held.
Make the witness lock limit an option.
Add required `exec' before Xdialog(1) invocation for the case where we
expect (require) data on stdin. The effect of this is that, when
backgrounded, $! returns the pid of an Xdialog(1) instance instead of
an sh(1) instance -- the difference being a later kill of $! will reach
the Xdialog(1) instance whereas without the exec the kill succeeds on
the sh(1) instance leaving Xdialog(1) open.
vn_path_to_global_path: update comment.
Revert r269404 and use cpu_ticks() for dbuf allocation.

Encode CPU's number by XOR'ing the CPU ID against the 64-bit cpu_ticks().

Reviewed by:	mav, gibbs
Differential Revision: https://phabric.freebsd.org/D521
MFC after:	2 weeks
Do not retry token errors. They are not going to disappear by themselves.

MFC after:	1 week