runtest: remove getgroups{02,04}

Since commit be0d9d6 wholly removed these two cases.

Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>
getdents01: compare "." or ".." to the first entry

If dir_index feature is enabled on ext3/4, the first entry may
not be ".". So fix to compare "." or ".." to the first entry.

Reported-by: DAN LI <li.dan@cn.fujitsu.com>
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>