Remove unused expected-output file.

src/test/isolation/expected/fk-delete-insert.out

-Parsed test spec with 2 sessions
-
-starting permutation: s1d s1c s2i s2c
-step s1d: DELETE FROM A WHERE AID = 1;
-step s1c: COMMIT;
-step s2i: INSERT INTO B (BID,AID,Col2) VALUES (2,1,0);
-ERROR:  insert or update on table "b" violates foreign key constraint "b_aid_fkey"
-step s2c: COMMIT;
-
-starting permutation: s1d s2i s1c s2c
-step s1d: DELETE FROM A WHERE AID = 1;
-step s2i: INSERT INTO B (BID,AID,Col2) VALUES (2,1,0); <waiting ...>
-step s1c: COMMIT;
-step s2i: <... completed>
-error in steps s1c s2i: ERROR:  insert or update on table "b" violates foreign key constraint "b_aid_fkey"
-step s2c: COMMIT;
-
-starting permutation: s1d s2i s2c s1c
-step s1d: DELETE FROM A WHERE AID = 1;
-step s2i: INSERT INTO B (BID,AID,Col2) VALUES (2,1,0); <waiting ...>
-invalid permutation detected
-
-starting permutation: s2i s1d s1c s2c
-step s2i: INSERT INTO B (BID,AID,Col2) VALUES (2,1,0);
-step s1d: DELETE FROM A WHERE AID = 1; <waiting ...>
-invalid permutation detected
-
-starting permutation: s2i s1d s2c s1c
-step s2i: INSERT INTO B (BID,AID,Col2) VALUES (2,1,0);
-step s1d: DELETE FROM A WHERE AID = 1; <waiting ...>
-step s2c: COMMIT;
-step s1d: <... completed>
-error in steps s2c s1d: ERROR:  update or delete on table "a" violates foreign key constraint "b_aid_fkey" on table "b"
-step s1c: COMMIT;
-
-starting permutation: s2i s2c s1d s1c
-step s2i: INSERT INTO B (BID,AID,Col2) VALUES (2,1,0);
-step s2c: COMMIT;
-step s1d: DELETE FROM A WHERE AID = 1;
-ERROR:  update or delete on table "a" violates foreign key constraint "b_aid_fkey" on table "b"
-step s1c: COMMIT;