Parsed test spec with 2 sessions

starting permutation: s1-begin s1-insert s2-update s1-commit
master_create_worker_shards

               
step s1-begin: 
    BEGIN;

step s1-insert: 
    INSERT INTO test_table VALUES(1);

step s2-update: 
    UPDATE test_table SET data = 'blarg' WHERE test_id = 1;
 <waiting ...>
step s1-commit: 
    COMMIT;

step s2-update: <... completed>

starting permutation: s1-insert s2-update
master_create_worker_shards

               
step s1-insert: 
    INSERT INTO test_table VALUES(1);

step s2-update: 
    UPDATE test_table SET data = 'blarg' WHERE test_id = 1;