Parsed test spec with 3 sessions

starting permutation: begin1 lock1 reindex2 drop3 end1
step begin1: BEGIN;
step lock1: LOCK reindex_schema.tab_locked IN SHARE UPDATE EXCLUSIVE MODE;
step reindex2: REINDEX SCHEMA reindex_schema; <waiting ...>
step drop3: DROP TABLE reindex_schema.tab_dropped;
step end1: COMMIT;
step reindex2: <... completed>

starting permutation: begin1 lock1 reindex_conc2 drop3 end1
step begin1: BEGIN;
step lock1: LOCK reindex_schema.tab_locked IN SHARE UPDATE EXCLUSIVE MODE;
step reindex_conc2: REINDEX SCHEMA CONCURRENTLY reindex_schema; <waiting ...>
step drop3: DROP TABLE reindex_schema.tab_dropped;
step end1: COMMIT;
step reindex_conc2: <... completed>