@Override
  public void tearDownBase() throws Exception {
    super.tearDownBase();
    removePeer(PEER_ID3);
  }
Make sure we will wait until all the SCPs finished in RemovePeerProcedure.
<p/>
See HBASE-27109 for more details.
hbase-server/src/test/java/org/apache/hadoop/hbase/replication/TestRemovePeerProcedureWaitForSCP.java