code: public DirectoryBuilder withPartition(final String partitionId, final String suffix) {
  
          this.partitions.put(partitionId, suffix);
          return this;
      }
docs: Adds a new partition to the {@link Directory} on initialization.
  
  @param partitionId
  the id of the partition
  @param suffix
  the suffix of the parition so that it can be addressed using a DN
  
  @return this builder