nfsd41: define nfs41 error codes

Define all error code present in
http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion1-29

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Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfsd41: clean up error code definitions]
[nfsd41: change NFSERR_REPLAY_ME]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>