Revert "nfsd4: return default lease period"

This reverts commit d6ebf5088f09472c1136cd506bdc27034a6763f8.

I forgot that the kernel's default lease period should never be
decreased!

After a kernel upgrade, the kernel has no way of knowing on its own what
the previous lease time was.  Unless userspace tells it otherwise, it
will assume the previous lease period was the same.

So if we decrease this value in a kernel upgrade, we end up enforcing a
grace period that's too short, and clients will fail to reclaim state in
time.  Symptoms may include EIO and log messages like "NFS:
nfs4_reclaim_open_state: Lock reclaim failed!"

There was no real justification for the lease period decrease anyway.

Reported-by: Donald Buczek <[email protected]>
Fixes: d6ebf5088f09 "nfsd4: return default lease period"
Cc: [email protected]
Signed-off-by: J. Bruce Fields <[email protected]>

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