check: add ext4 group list when testing ext2 and ext3

check: add ext4 group list when testing ext2 and ext3

Modern kernels use the ext4 implementation to support ext2 and ext3
mounts, and a number of the ext4 tests are actually suitable for
ext2 and ext3.  We're trying to move tests out of shared anyway, so
instead of moving tests from ext4/NNN to shared, let's just include
the ext4 group list when FSTYP is ext2 or ext3.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>