Change LogWarn to LogInfo if uid/gid to name mapping fails.

nfs4_uid_to_name and nfs4_gid_to_name may fail in some environments.
Change the LogWarn to LogInfo to avoid flooding the log file
under default logging configuration.

Ported from 1.5.x branch: 0940ec161849b523b8b9b8cd92fa4650131d2b54

Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Reviewed-by: Frank S. Filz <ffilzlnx@mindspring.com>
Don't allow setattr while the server is in grace

Ported from 1.5.x: 311e71dc2101cea6a96fa23744e1f40cb251ab93

If the server is in grace, send NFS4ERR_GRACE to NFS4 clients and
jukebox error to NFSv3 clients.

Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Reviewed-by: Frank S. Filz <ffilzlnx@mindspring.com>