@Override
    public String getReplicaPath() {
      return null;
    }
Constructor for {@link TestAmbryReplica}.

@param replicaSealStatus {@link ReplicaSealStatus} of this replica.
@param ambryPartition    {@link AmbryPartition} object.
@throws Exception in case of any error.
ambry-clustermap/src/test/java/com/github/ambry/clustermap/AmbryPartitionTest.java