Special fix for one of our customers.

We add logging to confirm we have leaking of endpoints of dead connections in the clientengnineimpl

Also an default disabled cleanup of these endpoints.

So if people don't enable this property, yu will just get additional logging in the health monitor
Improved dealing with exceptions + logging
Merge pull request #1825 from pveentjer/fix/3.maintenance/clientengine-endpointleaking

Dead endpoint leakage in clientengineimpl