Enclosure LED fixes

- Pass $VDEV_ENC_SYSFS_PATH to 'zpool [iostat|status] -c' to include
  enclosure LED sysfs path.

- Set LEDs correctly after import.  This includes clearing any erroniously
  set LEDs prior to the import, and setting the LED for any UNAVAIL drives.

- Include symlink for vdev_attach-led.sh in Makefile.am.

- Print the VDEV path in all-syslog.sh, and fix it so the pool GUID actually
  prints.    

Reviewed-by: Don Brady <don.brady@intel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes #5716 
Closes #5751

cmd/zed/zed.d/zed-functions.sh

@@ -413,3 +413,25 @@ zed_rate_limit()
     zed_unlock "${lockfile}" "${lockfile_fd}"
     return "${rv}"
 }
+
+
+# zed_guid_to_pool (guid)
+#
+# Convert a pool GUID into its pool name (like "tank")
+# Arguments
+#   guid: pool GUID (decimal or hex)
+#
+# Return
+#   Pool name
+#
+function zed_guid_to_pool
+{
+	if [ -z "$1" ] ; then
+		return
+	fi
+
+	guid=$(printf "%llu" $1)
+	if [ ! -z "$guid" ] ; then
+		$ZPOOL get -H -ovalue,name guid | awk '$1=='$guid' {print $2}'
+	fi
+}