Fix update-bootloader to run after grub-setup bsc#1222258

Also checked to ensure that the sequencing for all systemd services
now matches the ordering specified in helper/system.tree.

systemd/suse-migration-update-bootloader.service

@@ -1,6 +1,6 @@
 [Unit]
 Description=Update the bootloader
-After=suse-migration-update-bootloader.service
+After=suse-migration-grub-setup.service
 
 [Service]
 Type=oneshot