- 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

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

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

Scheduled sweep using the README guidelines.

Approved by: re (rwatson)

In my continuing crusade to make life better for non-sendmail users, avoid
the creation of /var/spool/clientmqueue and therefore the need for the
smmsp user and group if NO_SENDMAIL is defined. This required breaking out
the creation of the directory into a new BSD.sendmail.dist mtree file.

MFC after: 1 week