Backport 1.8.x: Acquire a per-lock lease to make renew and revoke atomic wrt each oth… #11808
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…er. (#11122)
Acquire a per-lock lease to make renew and revoke atomic wrt each other.
This means we don't have to hold pendingLock during I/O.
Attempted fix for deadlock in token revocation.
Comment fix.
Fix error checking in loadEntry.
Add benchmark
Add a few additional locking locations
Improve benchmark slightly
Update vault/expiration.go
Update vault/expiration.go
Add a lease lock into tidy