cxgbe(4):  some optimizations in freelist handling.

MFC after:	2 weeks.
MFV r269426:

Double test device size for ztest(1).

Illumos issue:
    5039 ztest should default to larger device sizes
    Author: Matthew Ahrens <mahrens@delphix.com>

MFC after:	2 weeks
MFV r269427:

In dnode_children_t, use C99's "[]" idiom for declaring the variable
sized array dnc_children at the end of the structure.

This prevents the compiler from mistakenly optimizing away accesses
beyond the array's defined size.

Illumos issue:
    5038 Remove "old-style" flexible array usage in ZFS.
    Author: Justin T. Gibbs <justing@spectralogic.com>

MFC after:	2 weeks
Handle wiring failures in vm_map_wire() with the new functions
pmap_unwire() and vm_object_unwire().

Retire vm_fault_{un,}wire(), since they are no longer used.

(See r268327 and r269134 for the motivation behind this change.)

Reviewed by:	kib
Sponsored by:	EMC / Isilon Storage Division
Add myself to calendar.freebsd and committers-src.dot

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
Report SPC-4 XCOPY capabilities (not yet implemented).
Implement PT and RRTI.
Add first pieces of WUT.