tdb2: speed up testing.
The time to run tests under valgrind has become excessive; particularly
the failure tests which fork(). Thus we cut down testing:
1) api-94-repack: reduce from 234 seconds to 2 seconds by cutting
iterations, despite adding TDB_VERSION1 tests.
2) api-missing-entries: reduce from 17 seconds to under 1 second by
not checking db inside loop, but at end.
This reduces the total ccanlint time from 729 to 489 seconds.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
(Imported from CCAN commit
a99c2ccf97465d47c3277d997ea93f20ff97ad4d)