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

socket()s first argument should be a protocol family rather than an
address family.

Add two missing includes

Probe for the availability of AF_INET6 at startup. If it's not
available, default ipv6cp to disabled and refuse to let the user
enable it.

$Id$ -> $FreeBSD$

Remove redundant includes

Oops - forgot these with the last commit.