update main to support mmd:type for personnel

[ferrighi]

While mmd v4 are prepared the indexer (main) should support parsing and indexing of mmd:personnel/mmd:type. Currently for personnel if mmd:type is present the following error is occurring:

could not be converted to solr document. Reason: 'personnel_datacenter_type'

This can be easily bypassed adding:

                    if entry_type == 'role':
                        mydict['personnel_{}_role'.format(personnel_role_LUT[role])] \
                            .append(personnel[entry])
                        mydict['personnel_role'].append(personnel[entry])
                    elif entry_type == 'type':
                        pass