chattr: provide an exit code in case of failure and add -f flag

chattr: provide an exit code in case of failure and add -f flag

Fix chattr so that if there are errors, it will report it via a
non-zero exit code.  It will now explicitly give errors when
attempting to set files that are not files or directories (which are
currently not supported under Linux).  The -f flag will suppress error
messages from being printed, although the exit status will still be
non-zero.

Addresses-Red-Hat-Bugzilla: #180596

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>