New module type for implementing app level session draining #394
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Introduces a new interface SessionModule. If a Module implements the SessionModule interface it will be treated differently when session draining is enabled.
When session draining starts, Pitaya will call
StartSessionDraining()
on all registered SessionModules. And when checking if sessions have been drained, Pitaya will callSessionCount()
on all registered SessionModules to check they have all reached zero.