Fix: Lock can be acquired after lease duration if the current owner has been terminated unexpectedly when using skipBlockingWait=true

[chris-ryan-square]

Issue #, if available: 44

Description of changes:

This solves the problem with the issue raised, allowing skipBlockingWait flag to be used safely. It tracks the "lookupTime" for the lock to handle if another client that has the lock has been terminated unexpectedly - and therefore can't update the lock itself.

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