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AthenaServices: Fix potential deadlock in RCUSvc.

Scott Snyder requested to merge ssnyder/athena:deadlock.AthenaServices-20200421 into master

When handle() quiesces an object, it's possible to get a call back into remove(). So the mutex we use should be recursive. Also, in the iteration over objects in handle(), protect against m_set being modified during the iteration.

Thanks to Stewart and Rafal for diagnosing.

See ATR-21227.

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