Parsed test spec with 2 sessions

starting permutation: s1_begin s1_lock s2_auth s2_cluster s1_commit s2_reset
step s1_begin: BEGIN;
step s1_lock: LOCK cluster_tab IN SHARE UPDATE EXCLUSIVE MODE;
step s2_auth: SET ROLE regress_cluster_conflict;
step s2_cluster: CLUSTER cluster_tab USING cluster_ind; <waiting ...>
step s1_commit: COMMIT;
step s2_cluster: <... completed>
step s2_reset: RESET ROLE;

starting permutation: s1_begin s2_auth s1_lock s2_cluster s1_commit s2_reset
step s1_begin: BEGIN;
step s2_auth: SET ROLE regress_cluster_conflict;
step s1_lock: LOCK cluster_tab IN SHARE UPDATE EXCLUSIVE MODE;
step s2_cluster: CLUSTER cluster_tab USING cluster_ind; <waiting ...>
step s1_commit: COMMIT;
step s2_cluster: <... completed>
step s2_reset: RESET ROLE;