merlimat opened a new pull request #1521: Removed contention between producers 
on ManagedLedger addEntry
   ### Motivation
   When there are multiple producers writing on the same topic and there are 
many entries/second (little batching), there can be thread contention when 
doing `managedLedger.addEntry()`. 
   ### Modifications
    * Do the sync part of add entry from a thread hashed on the name of the 
managed ledger. 
   ### Result
   This will remove the contention on both the `ManagedLedger` and the BK 
`LedgerHandler` mutexes.

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