Update ZTS to work on FreeBSD

Update the common ZTS scripts and individual test cases as needed 
in order to allow them to be run on FreeBSD.  The high level goal
is to provide compatibility wrappers whenever possible to minimize
changes to individual test cases.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Signed-off-by: Matt Macy <mmacy@FreeBSD.org>
Signed-off-by: Ryan Moeller <ryan@ixsystems.com>
Closes #9692

tests/zfs-tests/include/blkdev.shlib

@@ -79,6 +79,8 @@ function block_device_wait
 		typeset local elapsed=$((SECONDS - start))
 		[[ $elapsed > 60 ]] && \
 		    log_note udevadm settle time too long: $elapsed
+	elif is_freebsd; then
+		sleep 3
 	fi
 }
 
@@ -94,6 +96,9 @@ function is_physical_device #device
 		[[ -b "$DEV_DSKDIR/$device" ]] && \
 		[[ -f /sys/module/loop/parameters/max_part ]]
 		return $?
+	elif is_freebsd; then
+		echo $device | grep -q -e '^a?da[0-9]*$' -e '^md[0-9]*$' > /dev/null 2>&1
+		return $?
 	else
 		echo $device | egrep "^c[0-F]+([td][0-F]+)+$" > /dev/null 2>&1
 		return $?
@@ -131,10 +136,17 @@ function is_loop_device #disk
 }
 
 #
+# Linux:
 # Check if the given device is a multipath device and if there is a symbolic
 # link to a device mapper and to a disk
 # Currently no support for dm devices alone without multipath
 #
+# FreeBSD:
+# Check if the given device is a gmultipath device.
+#
+# Others:
+# No multipath detection.
+#
 function is_mpath_device #disk
 {
 	typeset disk=$1
@@ -149,6 +161,10 @@ function is_mpath_device #disk
 		else
 			return $?
 		fi
+	elif is_freebsd; then
+		test -b $DEV_MPATHDIR/$disk
+	else
+		false
 	fi
 }
 
@@ -178,6 +194,9 @@ function set_slice_prefix
 			fi
 			(( i = i + 1))
 		done
+	elif is_freebsd; then
+		export SLICE_PREFIX="p"
+		return 0
 	fi
 }
 
@@ -218,7 +237,7 @@ function get_device_dir #device
 {
 	typeset device=$1
 
-	if ! $(is_physical_device $device) ; then
+	if ! is_freebsd && ! $(is_physical_device $device) ; then
 		if [[ $device != "/" ]]; then
 			device=${device%/*}
 		fi
@@ -459,7 +478,7 @@ function get_pool_devices #testpool #devdir
 	typeset devdir=$2
 	typeset out=""
 
-	if is_linux; then
+	if is_linux || is_freebsd; then
 		out=$(zpool status -P $testpool |grep ${devdir} | awk '{print $1}')
 		out=$(echo $out | sed -e "s|${devdir}/||g" | tr '\n' ' ')
 	fi