WL#4477: Falcon Engine - Scavenge: load based trigger

Affects: WorkLog-3.4 — Status: Code-Review — Priority: Medium

Falcon scavenger is currently time based and can easily fall behind in heavy
workloads.

This change will keep the time based trigger for light workloads to ensure a
scavenge pass will occur and add a trigger that occurs when memory is
approaching a critical level.  This allows the background scavenger task to keep
up with a heavy workload.

For DBT2 Recommend: ScavengeThreshold=85% and ScavengeFloor=75%.  This should be
investigated for many workloads to decide a good default.

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