MFC r269858:

Add support for the SCTP_AUTH_SUPPORTED and SCTP_ASCONF_SUPPORTED
socket options. Add also a sysctl to control the support of ASCONF.
MFC r269945:

Add support for the SCTP_PR_STREAM_STATUS and SCTP_PR_ASSOC_STATUS
socket options. This includes managing the correspoing stat counters.
Add the SCTP_DETAILED_STR_STATS kernel option to control per policy
counters on every stream. The default is off and only an aggregated
counter is available. This is sufficient for the RTCWeb usecase.
Document r259328, geom_label is resize-aware.

Sponsored by:	The FreeBSD Foundation
Document r259355, WANDBOARD kernel configuration added.

Sponsored by:	The FreeBSD Foundation
Document r259450, Hyper-V support on i386.

Sponsored by:	The FreeBSD Foundation
Document r259453, RT5370/RT5372 support.

Sponsored by:	The FreeBSD Foundation
Document r260120, run(4) firmware update to 0.33.

Sponsored by:	The FreeBSD Foundation
Document r260178, fsck_ffs '-R' flag.

Sponsored by:	The FreeBSD Foundation
Document r260502, gmirror 'resize' command.

Sponsored by:	The FreeBSD Foundation
Document r260857 and r260858: unmapped IO support in
virtio_blk(4) and virtio_scsi(4).

Sponsored by:	The FreeBSD Foundation
Document r261090, bhyve APCI S5 poweroff.

Sponsored by:	The FreeBSD Foundation
Document r261868, Ralink RT3593 support.

Sponsored by:	The FreeBSD Foundation
Document r261972, nve(4) deprecation.

Sponsored by:	The FreeBSD Foundation
Document r262075, newsyslog(8) rotation by file size, instead
of blocks consumed by the target file.

Sponsored by:	The FreeBSD Foundation
Document r262137, axge(4) addition.

Sponsored by:	The FreeBSD Foundation
Specify the driver for notes about r259453 and r261868

Sponsored by:	The FreeBSD Foundation
Document r262363, urndis(4) import.

Sponsored by:	The FreeBSD Foundation
Document r262384, rctl_rules="" in rc.conf(5).

Sponsored by:	The FreeBSD Foundation
Document r262701, kernel selection menu in loader(8).

Sponsored by:	The FreeBSD Foundation
Remove debug output which was comitted by accident.
This is a direct commit to stable/10.