Copy stable/11@r303970 to releng/11.0 as part of the 11.0-RELEASE
cycle.

Prune svn:mergeinfo from the new branch, and rename it to RC1.

Update __FreeBSD_version.

Use the quarterly branch for the default FreeBSD.conf pkg(8) repo and
the dvd1.iso packages population.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Add nodevice iwmfw to WITHOUT_SOURCELESS_UCODE.

The sn driver doesn't actually include microcode at the current time,
although it may in the future. Or not since the ositech cards that
might need it have become perhaps too rare to support.

Import OpenBSD's rsu(4) WLAN driver.
Support chipsets are the Realtek RTL8188SU, RTL8191SU, and RTL8192SU.

Many thanks to Idwer Vollering for porting/writing the man page and for
testing.

Reviewed by: adrian, hselasky
Obtained from: OpenBSD
Tested by: kevlo, Idwer Vollering <vidwer at gmail.com>

Adding urtwn(4) firmware and related changes.

Reviewed by: rpaulo
Approved by: sbruno (mentor)

Move WITHOUT_SOURCELESS_* files to sys/conf/ in order to avoid "universe"
target processing them as if they were standalone kernel config files.

Approved by: kib (mentor)
MFC after: 5 days

Add "nodevice adw" to WITHOUT_SOURCELESS_UCODE.

Approved by: kib (mentor)
MFC after: 13 days

Add MK_SOURCELESS build option. Setting MK_SOURCELESS to "no" will disable
kernel modules that include binary-only code.

More fine-grained control is provided via MK_SOURCELESS_HOST (for native code
that runs on host CPU) and MK_SOURCELESS_UCODE (for microcode).

Reviewed by: julian, delphij, freebsd-arch
Approved by: kib (mentor)
MFC after: 2 weeks