test: Leave out the prefix when printing test names

When tests are all in the same suite it is annoying to have to read all
the common text after each name. Skip this to help the user.

Signed-off-by: Simon Glass <sjg@chromium.org>

test/cmd_ut.c

@@ -184,7 +184,7 @@ static int run_suite(struct unit_test_state *uts, struct suite *ste,
 		char prefix[30];
 
 		/* use a standard prefix */
-		snprintf(prefix, sizeof(prefix), "%s_test", ste->name);
+		snprintf(prefix, sizeof(prefix), "%s_test_", ste->name);
 		ret = cmd_ut_category(uts, ste->name, prefix, ste->start,
 				      n_ents, argc, argv);
 	}