Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

pkgbase: Put zfs utilities and lib in their own package

It is useful to have zfs utilities and lib in a separate package as
it allow users to create image that can support ZFS (i.e. not with
WITHOUT_ZFS in src.conf set) without bloating the default image with
all zfs tools (for example for jails).

Differential Revision: https://reviews.freebsd.org/D36225

Integrate cddl/usr.sbin/zfds/tests into the FreeBSD test suite

This change integrates the unit tests for zfsd into the test suite using the
integration method described in r345203.

This change removes the `LOCALBASE` includes added for the port version of
googlemock/googletest, as well as unnecessary `LIBADD`/`DPADD` and `CXXFLAGS`
defines, which are included in the `GTEST_CXXFLAGS` variable, as part of
r345203.

Reviewed by: asomers
Approved by: emaste (mentor)
MFC after: 2 months
MFC with: r345203
Differential Revision: https://reviews.freebsd.org/D19552

The zfsd tests need to depend on MK_GOOGLETEST instead of MK_TESTS

This will unbreak the build with mips*/powerpc*.

Sprinkle `${HAS_TESTS}` in Makefiles

While here, reindent `SUBDIR.${MK_TESTS}`

Build/install cddl/usr.sbin/zfsd/tests if MK_GOOGLETEST != no

Remove unnecessary variable (SRCDIR) replaced by SRCTOP in Makefile.common

MFC after: 1 week
X-MFC with: r305018
Sponsored by: EMC / Isilon Storage Division

zfsd(8), the ZFS fault management daemon

Add zfsd, which deals with hard drive faults in ZFS pools. It manages
hotspares and replements in drive slots that publish physical paths.

cddl/usr.sbin/zfsd
Add zfsd(8) and its unit tests

cddl/usr.sbin/Makefile
Add zfsd to the build

lib/libdevdctl
A C++ library that helps devd clients process events

lib/Makefile
share/mk/bsd.libnames.mk
share/mk/src.libnames.mk
Add libdevdctl to the build. It's a private library, unusable by
out-of-tree software.

etc/defaults/rc.conf
By default, set zfsd_enable to NO

etc/mtree/BSD.include.dist
Add a directory for libdevdctl's include files

etc/mtree/BSD.tests.dist
Add a directory for zfsd's unit tests

etc/mtree/BSD.var.dist
Add /var/db/zfsd/cases, where zfsd stores case files while it's shut
down.

etc/rc.d/Makefile
etc/rc.d/zfsd
Add zfsd's rc script

sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c
Fix the resource.fs.zfs.statechange message. It had a number of
problems:

It was only being emitted on a transition to the HEALTHY state.
That made it impossible for zfsd to take actions based on drives
getting sicker.

It compared the new state to vdev_prevstate, which is the state that
the vdev had the last time it was opened. That doesn't make sense,
because a vdev can change state multiple times without being
reopened.

vdev_set_state contains logic that will change the device's new
state based on various conditions. However, the statechange event
was being posted _before_ that logic took effect. Now it's being
posted after.

Submitted by: gibbs, asomers, mav, allanjude
Reviewed by: mav, delphij
Relnotes: yes
Sponsored by: Spectra Logic Corp, iX Systems
Differential Revision: https://reviews.freebsd.org/D6564