- 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 r264400,r265836:

r264400:

NO_MAN= has been deprecated in favor of MAN= for some time, go ahead
and finish the job. ncurses is now the only Makefile in the tree that
uses it since it wasn't a simple mechanical change, and will be
addressed in a future commit.

r265836:

Remove last two NO_MAN= in the tree. In both of these cases, MAN= is
what is needed.

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

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

Test process descriptors.

Ensure that process descriptors work as expected. We should be able to:
- pdfork(), like regular fork(), but producing a process descriptor
- pdgetpid() to convert a PD into a PID
- pdkill() to send signals to a process identified by a PD

Approved by: re (kib), mentor (rwatson)
Sponsored by: Google Inc

Test *at(2) calls with capability-mode lookup.

This commit adds regression testing for openat(), fstatat(), etc. with
capability scoping ("strict relative" lookup), which applies:
- in capability mode
- when performing any *at() lookup relative to a capability

These tests will fail until the *at() code is committed; on my local
instance, with the *at() changes, they all pass.

Approved by: re (kib), mentor (rwatson)
Sponsored by: Google Inc

Flesh out the cap_test regression test.

Add more regression testing, some of which is expected to fail until we
commit more kernel implementation.

Approved by: re (kib), mentor (rwatson)
Sponsored by: Google Inc

Regression tests for Capsicum capability mode.

Ensure that system calls that access global namespaces, e.g. open(2), are not permitted, and that whitelisted sysctls like kern.osreldate are.

Approved by: rwatson
Sponsored by: Google, Inc.