fs: make remaining filesystems use .rename2

This is trivial to do:

 - add flags argument to foo_rename()
 - check if flags is zero
 - assign foo_rename() to .rename2 instead of .rename

This doesn't mean it's impossible to support RENAME_NOREPLACE for these
filesystems, but it is not trivial, like for local filesystems.
RENAME_NOREPLACE must guarantee atomicity (i.e. it shouldn't be possible
for a file to be created on one host while it is overwritten by rename on
another host).

Filesystems converted:

9p, afs, ceph, coda, ecryptfs, kernfs, lustre, ncpfs, nfs, ocfs2, orangefs.

After this, we can get rid of the duplicate interfaces for rename.

Signed-off-by: Miklos Szeredi <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Acked-by: David Howells <[email protected]> [AFS]
Acked-by: Mike Marshall <[email protected]>
Cc: Eric Van Hensbergen <[email protected]>
Cc: Ilya Dryomov <[email protected]>
Cc: Jan Harkes <[email protected]>
Cc: Tyler Hicks <[email protected]>
Cc: Oleg Drokin <[email protected]>
Cc: Trond Myklebust <[email protected]>
Cc: Mark Fasheh <[email protected]>

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