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observed with RHEL 6.2

at some point client sends late SEQUENCE.
Server reply with NFS4ERR_EXPIRED. Client
attempts to establish a new session, but uses
old client id. Due to a bug in recovery procedure
This ends up with EXPIRED as well.

process current state id on save/restore current file handle

move exception handling into NFSServerV41 class

as v2, v3 and v4 specs backward compatible with error codes,
merge them into a single utility class. NFSException updated
to print human readable string.

server scope and owners should be configurable and bound to file filesystem and/or dataserver