use shutdown in more tests

(This used to be ctdb commit 150153947b959f90991fdae8d7c85ef8d551dff5)

ctdb/tests/ctdb_bench.c

@@ -259,6 +259,7 @@ int main(int argc, const char *argv[])
 	bench_ring(ctdb, ev);
        
 	/* shut it down */
-	talloc_free(ctdb);
+	ctdb_shutdown(ctdb);
+
 	return 0;
 }

ctdb/tests/ctdb_fetch.c

@@ -247,7 +247,8 @@ int main(int argc, const char *argv[])
 
 	printf("DATA:\n%s\n", (char *)call.reply_data.dptr);
 
-	/* shut it down */
-	talloc_free(ctdb);
+	/* go into a wait loop to allow other nodes to complete */
+	ctdb_shutdown(ctdb);
+
 	return 0;
 }

ctdb/tests/ctdb_messaging.c

@@ -141,6 +141,7 @@ int main(int argc, const char *argv[])
 	}
        
 	/* shut it down */
-	talloc_free(ctdb);
+	ctdb_shutdown(ctdb);
+
 	return 0;
 }