[Labeled-nfs] Client process label operation (OP_PUTCLIENTLABEL)

[Matthew N. Dodd]

So, as an alternative to a new RPCSEC flavor, encoding the requesting 
process label in all client compound operations was suggested.

Attached is a patch that demonstrates one way of doing this.

For demonstration purposes I'm forcing the addition of a 
OP_PUTCLIENTLABEL in encode_compound_hdr(), which covers all NFSv4 
operations sent to the server.  This is ideal as it involves the least 
amount of code change.

I'd like to make this behavior conditional on
'server->caps & NFS_CAP_SECURITY_LABEL' (added in other patches).

My problem is that there appears to be no way of performing conditional 
operations based on server capabilities in nfs/nfs4xdr.c as the context 
passed in by the RPC dispatch doesn't have any way of producing a 
'struct nfs_server'.

I'd like to avoid having to change every operation argument.

Opaque data pointers in 'struct rpc_xprt' might help.

Ideas?
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