- 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: r277949:
New function smbios_match to detect BIOS versions during boot

MFC: r277957:
Fix order of functions in smbios.c (corrects r277949)

MFC: r281138:
SMBIOS support for EFI

r281138 makes changes to the new unified EFI loader (r280950), which has not been merged to stable/10 (and likely won't be).
These changes were manually applied to the amd64 EFI loader (sys/boot/amd64/efi).
The changes to sys/boot/amd64/efi are a direct commit.

Reviewed by: stas
Approved by: re (gjb), marcel
Sponsored by: ScaleEngine Inc.
Differential Revision: https://reviews.freebsd.org/D3129

SMBIOS support for EFI.

MFC after: 1 week