- 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 r282067:

Integrate tools/regression/fifo into the FreeBSD test suite as tests/sys/fifo
and tools/regression/file into the FreeBSD test suite as tests/sys/file

Integrate tools/regression/fifo into the FreeBSD test suite as tests/sys/fifo
and tools/regression/file into the FreeBSD test suite as tests/sys/file

MFC after: 1 week

Integrate tools/regression/fifo into the FreeBSD test suite as tests/sys/fifo

Integrate more tests into the FreeBSD test suite from tools/regression, etc

Use different temporary directory templates for fifo_io and fifo_open so
that if the tests fail to GC their working spaces, it's clear which it is.

After going to some trouble to create a temporary directory in which to run
fifo tests, chdir to it.

Add fifo_open, a basic regression test for opening fifos, which tests
the blocking and non-blocking forms of open based on the POSIX spec for
now O_NONBLOCK should be handled.