- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.3.
- Update default pkg(8) configuration to use the quarterly branch.

Approved by: re (implicit)

MFC r290563,r290868,r291038:

r290563:

Integrate tools/regression/lib/libc/net into the FreeBSD test suite
as lib/libc/tests/net

Also, fix eui64_aton_test:test_str(..). The test was comparing the result
of eui64_aton to a pointer of the expected result.

Sponsored by: EMC / Isilon Storage Division

r290868:

Fix -Wformat issues

Reported by: gcc
Sponsored by: EMC / Isilon Storage Division

r291038:

Do not print out errno if the call succeeded unexpectedly; this was a mistake
made in r290868

Reported by: jilles
Sponsored by: EMC / Isilon Storage Division

Integrate tools/regression/lib/libc/net into the FreeBSD test suite
as lib/libc/tests/net

Also, fix eui64_aton_test:test_str(..). The test was comparing the result
of eui64_aton to a pointer of the expected result.

MFC after: 1 week
Sponsored by: EMC / Isilon Storage Division

Switch over to a different, more flexible test output protocol that's
understood by Perl's Test::Harness module and prove(1) commands.

Update README to describe the new protocol. The work's broken down into
two main sets of changes.

First, update the existing test programs (shell scripts and C programs)
to produce output in the ok/not ok format, and to, where possible, also
produce a header describing the number of tests that are expected to be
run.

Second, provide the .t files that actually run the tests. In some cases
these are copies of, or very similar too, scripts that already existed.
I've kept the old scripts around so that it's possible to verify that
behaviour under this new system (in terms of whether or not a test fails)
is identical to the behaviour under the old system.

Add a TODO file.

Fix stupid patch(1) tricks. Apparently patch thinks all files match the
empty file so if you accidently apply a patch created with diff -N
twice, you get files with duplicate contents.

Reported by: Antoine Brodin <antoine.brodin at laposte.net>

Add support for an /etc/eui64 file modeled on /etc/ethers. The API is
modeled on ethers(3) except that all functions are thread-safe.

Reviewed by: simokawa