radix tree test suite: Dial down verbosity with -v

Make the output of radix tree test suite less verbose by default and add
-v and -vv command line options for increasing level of verbosity.

Signed-off-by: Rehas Sachdeva <aquannie@gmail.com>
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>

tools/testing/radix-tree/regression1.c

@@ -193,7 +193,7 @@ void regression1_test(void)
 	long arg;
 
 	/* Regression #1 */
-	printf("running regression test 1, should finish in under a minute\n");
+	printv(1, "running regression test 1, should finish in under a minute\n");
 	nr_threads = 2;
 	pthread_barrier_init(&worker_barrier, NULL, nr_threads);
 
@@ -216,5 +216,5 @@ void regression1_test(void)
 
 	free(threads);
 
-	printf("regression test 1, done\n");
+	printv(1, "regression test 1, done\n");
 }