backup: set in vg_commit

Another step towards better automatic handling of backup,
and automatically setup needs_backup after commit.

In some next step we should reduce number of backups and takem
then only at the command finish with  vg_committed content.

lib/metadata/lv_manip.c

@@ -6791,8 +6791,6 @@ int lv_remove_single(struct cmd_context *cmd, struct logical_volume *lv,
 					display_lvname(pool_lv));
 	}
 
-	vg->needs_backup = 1;
-
 	lockd_lv(cmd, lock_lv, "un", LDLV_PERSISTENT);
 	lockd_free_lv(cmd, vg, lv->name, &lv->lvid.id[1], lv->lock_args);
 

lib/metadata/metadata.c

@@ -3173,6 +3173,7 @@ int vg_commit(struct volume_group *vg)
 			dm_list_init(&vg->msg_list);
 			vg->needs_write_and_commit = 0;
 		}
+		vg->needs_backup = 0;
         }
 
 	/* If at least one mda commit succeeded, it was committed */