bsdinstall on zfs: create dataset for /home rather than /usr/home

Now that pw (hence adduser and the initial install) use /home for
user home directories rather than /usr/home, create a dataset for
/home rather than /usr/home.  Update the man page to match.

Reviewed by:	rgrimes, markj
Differential Revision:	https://reviews.freebsd.org/D40086

usr.sbin/bsdinstall/bsdinstall.8

@@ -125,9 +125,9 @@ Provides a ZFS-only automatic interactive disk partitioner.
 Creates a single
 .Ic zpool
 with separate datasets for
+.Pa /home ,
 .Pa /tmp ,
 .Pa /usr ,
-.Pa /usr/home ,
 .Pa /usr/ports ,
 .Pa /usr/src ,
 and
@@ -598,15 +598,15 @@ is:
 /$ZFSBOOT_BEROOT_NAME				mountpoint=none
 /$ZFSBOOT_BEROOT_NAME/$ZFSBOOT_BOOTFS_NAME	mountpoint=/
 
+# Home directories separated so they are common to all BEs
+/home		mountpoint=/home
+
 # Compress /tmp, allow exec but not setuid
 /tmp		mountpoint=/tmp,exec=on,setuid=off
 
 # Do not mount /usr so that 'base' files go to the BEROOT
 /usr		mountpoint=/usr,canmount=off
 
-# Home directories separated so they are common to all BEs
-/usr/home	# NB: /home is a symlink to /usr/home
-
 # Ports tree
 /usr/ports	setuid=off
 

usr.sbin/bsdinstall/scripts/zfsboot

@@ -150,15 +150,15 @@ f_isset ZFSBOOT_DATASETS || ZFSBOOT_DATASETS="
 	/$ZFSBOOT_BEROOT_NAME				mountpoint=none
 	/$ZFSBOOT_BEROOT_NAME/$ZFSBOOT_BOOTFS_NAME	mountpoint=/
 
+	# Home directories separated so they are common to all BEs
+	/home		mountpoint=/home
+
 	# Compress /tmp, allow exec but not setuid
 	/tmp		mountpoint=/tmp,exec=on,setuid=off
 
 	# Don't mount /usr so that 'base' files go to the BEROOT
 	/usr		mountpoint=/usr,canmount=off
 
-	# Home directories separated so they are common to all BEs
-	/usr/home	# NB: /home is a symlink to /usr/home
-
 	# Ports tree
 	/usr/ports	setuid=off