- 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 r282062:

Fix -Wformat warnings by using proper format string qualifiers for
long and unsigned[ long] types

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Fixed error checking of pthread(3) functions.

PR: 143807
Submitted by: pluknet (partly)

Add some more comments and a -4 argument to restrict searches to only
A (not default A and AAAA) records. Now the longest time that a -4
thread might hang trying to resolve is only 2:30 instead of 5:00 ;)

Print the maximum resolution time encountered by each thread. Did you
know that the resolver might keep trying on a getaddrinfo() for up to
FIVE MINUTES?

Add my getaddrinfo(3) stress-tester as gaithrstress. The most obvious
regressions would be to see the program or your kernel crashing.

If you want to give it something to really test out, try a much more
reentrant version of the resolver.
<URL:http://green.homeunix.org/~green/reentrant_resolver.patch>
Any Mozilla-based browser would show you a clear difference.