remount: consolidate remount-api-vfs and remount-rootfs into one

This has the advantage of removing a confusing warning by mount if the
root directory is not listed in fstab.

src/core/special.h

@@ -65,7 +65,7 @@
 #define SPECIAL_FSCK_SERVICE "fsck@.service"
 #define SPECIAL_QUOTACHECK_SERVICE "quotacheck.service"
 #define SPECIAL_QUOTAON_SERVICE "quotaon.service"
-#define SPECIAL_REMOUNT_ROOTFS_SERVICE "remount-rootfs.service"
+#define SPECIAL_REMOUNT_FS_SERVICE "systemd-remount-fs.service"
 
 /* Services systemd relies on */
 #define SPECIAL_DBUS_SERVICE "dbus.service"

src/core/swap.c

@@ -211,9 +211,9 @@ static int swap_add_device_links(Swap *s) {
                                           UNIT(s)->manager->running_as == MANAGER_SYSTEM);
         else
                 /* File based swap devices need to be ordered after
-                 * remount-rootfs.service, since they might need a
+                 * systemd-remount-fs.service, since they might need a
                  * writable file system. */
-                return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_ROOTFS_SERVICE, NULL, true);
+                return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true);
 }
 
 static int swap_add_default_dependencies(Swap *s) {