- 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

Use 'manual page' instead of 'man page' for consistency.

Approved by: re (hrs)

(Mostly) markup fixes.

Approved by: re (blanket)

Document that the returned pointer should be freed even if the number
of items returned is 0.

Add devclass_get_drivers(9) which provides an array of pointers to driver
instances in a given devclass. This is useful for systems that want to
call code in driver static methods, similar to device_identify().

Reviewed by: dfr
MFC after: 2 weeks