Update and desolarization of zfs(8) and zpool(8) manual pages:

- synchronized to match new vendor code (Illumos rev. 13513) [1]
- removed references to sun commands (replaced with FreeBSD commands)
- removed ATTRIBUTES sections
- updated SEE ALSO sections
- properly updated copyright information (required by CDDL)
- remove empty lines via MANFILTER

zfs(8) only:
- replaced "Zones" section with new "Jails" section
- removed misleading "ZFS Volumes as Swap or Dump Devices" section
- updated shareiscsi and sharesmb option information (not supported on FreeBSD)
- replace zoned property with jailed property

zpool(8) only:
- updated device names in examples

Obtained from:	Illumos (as of rev. 13513:f84d4672fdbd) [1]
MFC after:	1 week

cddl/sbin/zfs/Makefile

@@ -25,4 +25,6 @@ DPADD=	${LIBGEOM} ${LIBNVPAIR} ${LIBUMEM} \
 	${LIBUTIL} ${LIBUUTIL} ${LIBZFS}
 LDADD=	-lgeom -lnvpair -lumem -lutil -luutil -lzfs
 
+MANFILTER=	sed -e '/^$$/d'
+
 .include <bsd.prog.mk>

cddl/sbin/zpool/Makefile

@@ -30,4 +30,6 @@ DPADD=	${LIBAVL} ${LIBGEOM} ${LIBNVPAIR} \
 	${LIBUMEM} ${LIBUTIL} ${LIBUUTIL} ${LIBZFS}
 LDADD=	-lavl -lgeom -lnvpair -lumem -lutil -luutil -lzfs
 
+MANFILTER=	sed -e '/^$$/d'
+
 .include <bsd.prog.mk>