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

Plug a possible memory leak.

MFC after: 2 weeks

Fix build with gcc

MFC after: 3 days

Improve SRV records support for the pkg(8) bootstrap:
- order srv records by priorities
- for all entries of the same priority, order randomly respect the weight
- select the port where to fetch from respect the port provided in the SRV record

Obtained from: pkg git repo
MFC after: 3 days

Fix a bad calloc(3) call

MFC after: 2 weeks

Directly uses calloc(3) instread of malloc(3) + memset(3)

Reported by: Jeremy Chadwick <jdc@koitsu.org>
MFC after: 3 days

if PACKAGESITE url scheme is not 'file://', always try to revolv SRV records and
use them if any. It allows the bootstrap to use directly pkg.FreeBSD.org instead
of pkgbeta.FreeBSD.org

MFC after: 1 month