Implements Sessions in the lock client#26

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SUMUKHA-PK merged 14 commits intomasterfrom

Nov 8, 2020

Commits on Oct 5, 2020

this commit implements a basic structure for sessions
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Commits on Oct 7, 2020

this commit adds a part of support for sessions in the lock client: timer implementaion, splitting of domains for acquire and release, addition of context
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Commits on Oct 8, 2020

this commit implements all basic needs for a session implementation in the lock client: gracefulShutdown, maintaining list of current locks
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Commits on Oct 10, 2020

Commits on Oct 11, 2020

this commit fixes a race condition when session times out
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