NFSD: Replace use of NFSD_MAY_LOCK in nfsd4_lock()

NFSv4 LOCK operations should not avoid the set of authorization
checks that apply to all other NFSv4 operations. Also, the
"no_auth_nlm" export option should apply only to NLM LOCK requests.
It's not necessary or sensible to apply it to NFSv4 LOCK operations.

Instead, set no permission bits when calling fh_verify(). Subsequent
stateid processing handles authorization checks.

Reported-by: NeilBrown <[email protected]>
Signed-off-by: Chuck Lever <[email protected]>

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