- 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)

MFH (r292206): upgrade to Unbound 1.5.7
MFH (r292135): run configure script with correct compiler

MFH (r266114, r266138): upgrade to latest ldns and unbound
MFH (r266139-r266143, r266145, r266149, r266150): fix props
MFH (r266179, r266180, r266193, r266238, r266777): misc cleanup
MFH (r266863): create and use /var/unbound/conf.d
MFH (r268839): import unblock-lan-zones patch from upstream
MFH (r268840): fix reverse lookups on private networks
MFH (r268883): avoid spamming source tree during build

PR: 190739 (for r268883)

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

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

Regenerate the configure script before running it.
Set the default config file to /var/unbound/unbound.conf.

Approved by: re (blanket)

Due to a missing command-line argument, yacc regenerated the parser but
not its header file, resulting in a mismatch between the lexer and parser
and strange errors when reading the configuration file.

Approved by: re (blanket)

Set props and correct RCS ID tag.

Approved by: re (blanket)

Set the correct prefix and exec-prefix.

Approved by: re (blanket)

Two helper scripts for porting Unbound:

- freebsd-configure.sh runs ./configure with the correct parameters
and regenerates the lex and yacc code.

- freebsd-sources.pl untangles the upstream Makefile and generates
source lists for our Makefiles.

Approved by: re (blanket)