- 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)

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

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

o getsockopt(2) 'level' argument should be 0, not SOCK_STREAM. It
does not hurt anything because uipc_ctloutput() does not check
sopt->sopt_level.

Pointed out by: ru
MFC after: 1 week

o Fix bogus getsockopt(2) call: swap SOCK_STREAM and LOCAL_PEERCRED.
The bug does not affect anything because SOCK_STREAM == LOCAL_PEERCRED == 0x1.

PR: bin/46165
Submitted by: Alain Thivillon <at@rominet.net>
Reviewed by: dd
MFC after: 1 week

Introduce a version field to `struct xucred' in place of one of the
spares (the size of the field was changed from u_short to u_int to
reflect what it really ends up being). Accordingly, change users of
xucred to set and check this field as appropriate. In the kernel,
this is being done inside the new cru2x() routine which takes a
`struct ucred' and fills out a `struct xucred' according to the
former. This also has the pleasant sideaffect of removing some
duplicate code.

Reviewed by: rwatson

Fixed slipage in editor.

Fix SCM ID's.

Implement getpeereid(3), a front-end to the LOCAL_PEERCRED
socket option for the Unix domain. It's weaker than the
socket option (this only returns the uid and gid, while the
socket opt. can return the entire group list), and is
implemented mostly for compatibility with OpenBSD.