Description of problem:

When the client knows that it's doing pnfs (ie after getting a layout,deviceid) it's not marking the EXCHANGE_ID to a DS server with EXCHGID4_FLAG_USE_PNFS_DS flag.

An upstream commit fixes that issue: "NFSv4.1: use EXCHGID4_FLAG_USE_PNFS_DS for DS server". Once I have a commit id, I'll update.

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