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>
diff --git a/tools/testing/radix-tree/linux.c b/tools/testing/radix-tree/linux.c
index 3e4f9f3..94bcdb99 100644
--- a/tools/testing/radix-tree/linux.c
+++ b/tools/testing/radix-tree/linux.c
@@ -14,6 +14,7 @@
 int nr_allocated;
 int preempt_count;
 int kmalloc_verbose;
+int test_verbose;
 
 struct kmem_cache {
 	pthread_mutex_t lock;