- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

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

Give fstest a more unique name: pjdfstest.
It is released from time to time and used outside FreeBSD, so it is good to
have a name one can google.

- Use loops to avoid code duplication.
- More tests.

IFp4: Regression tests for FreeBSD/ZFS chflags(2)/lchflags(2).

Add 3436 file system regression tests in 184 files.
Almost all regression tests are based on very flexible fstest tool.
They verify correctness (POSIX conformance) of almost all file
system-related system calls.

The motivation behind this work is my ZFS port and POSIX, who doesn't
provide free test suites.

Runs on: FreeBSD/UFS, FreeBSD/ZFS, Solaris/UFS, Solaris/ZFS

To try it out:

# cd fstest
# make
# find tests/* -type d | xargs prove