Muon Reco Memory leak fix

Walter Lamplrequested to merge
wlampl/athena:virtCleanup into master

Fix for memory leaks origination in MuPatHitTool.

  1. Calling cleanUp through the lengthy call-chain didn't work b/c of missing virtual keyword in two base classes
  2. cleanUp was missing in MuonStauRecoTool

valgrind is still running to confirm that the leak is gone.

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