Bookkeeper throttling - permits is not released when read has failed from all 
replicas
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                 Key: BOOKKEEPER-186
                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-186
             Project: Bookkeeper
          Issue Type: Bug
          Components: bookkeeper-client
    Affects Versions: 4.0.0
            Reporter: Rakesh R
             Fix For: 4.1.0


Permit is not releasing in the case when there is no quorum available and the 
readEntries operation failed from all replicas.

Following is the condition where it checks the failure in quorum and invoking 
ReadCallback:
{noformat}
void sendRead(ArrayList<InetSocketAddress> ensemble, LedgerEntry entry, int 
lastErrorCode) {
   if (entry.nextReplicaIndexToReadFrom >= lh.metadata.quorumSize) {
      // we are done, the read has failed from all replicas, just fail the
      // read
      submitCallback(lastErrorCode);
      return;
   }
{noformat}

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