Accept XL test output.

Accept XL test output.

Fixes 17 tests.

Reasons:

timestamp Issue, some ERROR string differences,
remote subquery plan differences.

No support in XL for: TRIGGERS, correlated UPDATE,
SAVEPOINT, WHERE CURRENT OF, internal subtransactions,
complicated SELECT queries in plpgsql functions,
distribution column in child table to refer to non
distribution column in referenced table,
ORDER BY in subqueries, FOREIGN DATA WRAPPER, SERVER,
USER MAPPING