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

xo_config.h no longer in contrib, so -I's needed

PR: /homes/sjg/commit-logs/freebsd/libxo/xo_config.diff
Reviewed by: jkim

Make libxo depend on libutil because it uses humanize_number after r287111

Remove overlinking in lib/libxo/tests, sbin/savecore, and
usr.bin/{iscsictl,wc,xo}

PR: 203673
Sponsored by: EMC / Isilon Storage Division

Integrate the tests from libxo into the FreeBSD test suite

The functional_test.sh harness for each test subdir was inspired
by the version in bin/sh/tests/functional_test.sh

Some gymnastics were required to deal with implicit rules for
.c / .o -> .out as the suffix transformation rules were
incorrectly trying to create the test outputs from some of the
source files

Sponsored by: EMC / Isilon Storage Division

Use LIBXOSRC instead of LIBXO when defining the path to contrib/libxo

The latter is already defined in bsd.libnames.mk, so avoid the conflict
in case someone copy-pastes make variables

While here, switch path to the top of the source tree with SRCTOP

Upgrade libxo to 0.4.5.

Local changes incorporated by 0.4.5: r284340
Local changes retained: r276260, r282117

Obtained from: https://github.com/Juniper/libxo

Convert to usr.bin/ to LIBADD
Reduce overlinking

Hook xo(1) to the build -- it's like echo, but uses libxo to
support emitting machine-readable output.

Sponsored by: Juniper Networks, Inc.