FreeBSD_HEAD - Build #3057 - Fixed

FreeBSD_HEAD - Build #3057 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD/3057/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD/3057/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD/3057/console

Change summaries:

286578 by mav:
Fix r286574 build in user-space.

286577 by melifaro:
Partially merge r274887,r275334,r275577,r275578,r275586 to minimize
differences between projects/routing and HEAD.

This commit tries to keep code logic the same while changing underlying
code to use unified callbacks.

* Add llt_foreach_entry method to traverse all entries in given llt
* Add llt_dump_entry method to export particular lle entry in sysctl/rtsock
  format (code is not indented properly to minimize diff). Will be fixed
  in the next commits.
* Add llt_link_entry/llt_unlink_entry methods to link/unlink particular lle.
* Add llt_fill_sa_entry method to export address in the lle to sockaddr
  format.
* Add llt_hash method to use in generic hash table support code.
* Add llt_free_entry method which is used in llt_prefix_free code.

* Prepare for fine-grained locking by separating lle unlink and deletion in
  lltable_free() and lltable_prefix_free().

* Provide lltable_get<ifp|af>() functions to reduce direct 'struct lltable'
 access by external callers.

* Remove _at_llt agrument from lle_free() lle callback since it was unused.
* Temporarily add L3_CADDR() macro for 'const' sockaddr typecasting.
* Switch to per-af hashing code.
* Rename LLE_FREE_LOCKED() callback from in[6]_lltable_free() to
  in_[6]lltable_destroy() to avoid clashing with llt_free_entry() method.
  Update description from these functions.
* Use unified lltable_free_entry() function instead of per-af one.

Reviewed by:	ae

286576 by mav:
Fix r286570 build with debug.

286575 by mav:
MFV r277428: 5056 ZFS deadlock on db_mtx and dn_holds

Reviewed by: Will Andrews <willa_at_spectralogic.com>
Reviewed by: Matt Ahrens <mahrens_at_delphix.com>
Reviewed by: George Wilson <george.wilson_at_delphix.com>
Approved by: Dan McDonald <danmcd_at_omniti.com>
Author: Justin Gibbs <justing_at_spectralogic.com>

illumos/illumos-gate_at_bc9014e6a81272073b9854d9f65dd59e18d18c35

286574 by mav:
MFV r277427: 5445 Add more visibility via arcstats; specifically
arc_state_t stats and differentiate between "data" and "metadata"

Reviewed by: Basil Crow <basil.crow_at_delphix.com>
Reviewed by: George Wilson <george.wilson_at_delphix.com>
Reviewed by: Matthew Ahrens <mahrens_at_delphix.com>
Reviewed by: Bayard Bell <bayard.bell_at_nexenta.com>
Approved by: Robert Mustacchi <rm_at_joyent.com>
Author: Prakash Surya <prakash.surya_at_delphix.com>

illumos/illumos-gate_at_4076b1bf41cfd9f968a33ed54a7ae76d9e996fe8

286573 by brueffer:
Xref iwm(4).

286572 by brueffer:
Add iwm(4) to the hardware notes.