WriteId must be requested before taking locks during inserts

It turned out that the writeId as saved to DB by HMS during lock creating for inserts, because this info is used to delete the folders created by aborted/time outed inserts. This seems a bit hacky but makes sense, as during lock creation we express the intention of the transaction for the given table ( https://github.infra.cloudera.com/CDH/hive/blob/4604ca6f1077dd808055539e95e9b9be97cdb312/standalone-metastore/src/main/thrift/hive_metastore.thrift#L1123 ), while this information is express in th other APIs (open_txns, allocate_table_write_ids).

Currently Impala takes the lock first, which can cause issues during the cleanup of aborted/timeouted inserts.