ext2,ext3,ext4: don't inherit APPEND_FL or IMMUTABLE_FL for new inodes

ext2,ext3,ext4: don't inherit APPEND_FL or IMMUTABLE_FL for new inodes

commit 1cd9f0976aa4606db8d6e3dc3edd0aca8019372a upstream.

This doesn't make much sense, and it exposes a bug in the kernel where
attempts to create a new file in an append-only directory using
O_CREAT will fail (but still leave a zero-length file).  This was
discovered when xfstests #79 was generalized so it could run on all
file systems.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>