fs: support RENAME_NOREPLACE for local filesystems

fs: support RENAME_NOREPLACE for local filesystems

This is trivial to do:

 - add flags argument to foo_rename()
 - check if flags doesn't have any other than RENAME_NOREPLACE
 - assign foo_rename() to .rename2 instead of .rename

Filesystems converted:

affs, bfs, exofs, ext2, hfs, hfsplus, jffs2, jfs, logfs, minix, msdos,
nilfs2, omfs, reiserfs, sysvfs, ubifs, udf, ufs, vfat.

Signed-off-by: Miklos Szeredi <[email protected]>
Acked-by: Boaz Harrosh <[email protected]>
Acked-by: Richard Weinberger <[email protected]>
Acked-by: Bob Copeland <[email protected]>
Acked-by: Jan Kara <[email protected]>
Cc: Theodore Ts'o <[email protected]>
Cc: Jaegeuk Kim <[email protected]>
Cc: OGAWA Hirofumi <[email protected]>
Cc: Mikulas Patocka <[email protected]>
Cc: David Woodhouse <[email protected]>
Cc: Dave Kleikamp <[email protected]>
Cc: Ryusuke Konishi <[email protected]>
Cc: Christoph Hellwig <[email protected]>