Order zfs-import-*.service after multipathd

If someone is using both multipathd and ZFS, they are probably using
them together.  Ordering the zpool imports after multipathd is ready
fixes import issues for multipath configurations.

Tested-by: Mike Pastore <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Richard Laager <[email protected]>
Closes #9863

Author: rlaager

etc/systemd/system/zfs-import-cache.service.in

@@ -5,6 +5,7 @@ DefaultDependencies=no
 Requires=systemd-udev-settle.service
 After=systemd-udev-settle.service
 After=cryptsetup.target
+After=multipathd.target
 After=systemd-remount-fs.service
 Before=zfs-import.target
 ConditionPathExists=@sysconfdir@/zfs/zpool.cache

etc/systemd/system/zfs-import-scan.service.in

@@ -5,6 +5,7 @@ DefaultDependencies=no
 Requires=systemd-udev-settle.service
 After=systemd-udev-settle.service
 After=cryptsetup.target
+After=multipathd.target
 Before=zfs-import.target
 ConditionPathExists=!@sysconfdir@/zfs/zpool.cache