- Copy stable/10@285827 to releng/10.2 in preparation for 10.2-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.2.
- Update default pkg(8) configuration to use the quarterly branch.[1]

Discussed with: re, portmgr [1]
Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC: r278870

Unbreak sparc64 after r276630 (MFCed to stable/10 in r277317) by calling
__sparc_sigtramp_setup signal trampoline as part of the MD __sys_sigaction
again.

Submitted by: kib (initial versions)

Unbreak sparc64 after r276630 by calling __sparc_sigtramp_setup signal
trampoline as part of the MD __sys_sigaction again.

Submitted by: kib (initial versions)
MFC after: 3 days

Install the userland signal trampoline when sigaction is first called,
instead of on startup. This fixes binary compatibility of dynamically
linked binaries from before the signal code move.

Suggested by: wollman (a long time ago)