perf tests shell: Skip base_* dirs in test script search

The test scripts in base_* directories currently have their own drivers
that run them. Before this patch, the shell test-suite generator causes
them to run twice. Fix that by skipping them in the generator.

A cleaner solution (for future) will be to use the directory structure
idea (introduced by Carsten Haitzler in 7391db645938 ("perf test:
Refactor shell tests allowing subdirs")) to generate test entries with
subtests, like:

$ perf test list
[...]
97: perf probe shell tests
97:1: perf probe basic functionality
97:2: perf probe tests with arguments
97:3: perf probe invalid options handling
[...]

There is already a lot of shell test scripts and many are about to come,
so there is a need for some hierarchy.

Signed-off-by: Michael Petlan <[e-mail]>
Cc: Athira Rajeev <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Masami Hiramatsu <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Veronika Molnarova <[e-mail]>
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/tests/tests-scripts.c

···
 			if (!S_ISDIR(st.st_mode))
 				continue;
 		}
+		if (strncmp(ent->d_name, "base_", 5) == 0)
+			continue; /* Skip scripts that have a separate driver. */
 		fd = openat(dir_fd, ent->d_name, O_PATH);
 		append_scripts_in_dir(fd, result, result_sz);
 	}