[pnfs] Server sessions slot table patches

[William A. (Andy) Adamson]

hi

here are 9 patches that implement the server slot table management. there is
not DRC yet, but this code has been developed with the DRC in mind. This
code almost passes the connectathon tests on the 4.1-sessions branch with
the client patches i just sent out.

it fails the general connectathon tests with an NFS4ERR_SEQ_MISORDERED. i
note that the client mostly uses slot 0, and occasionally uses slot 1. the
slot 1 sequence is out of order - i don't know if it is the client or
server.

please review the patches...

thanks

-->Andy
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