Each zone used in the "inline" system test contains a few dozen records.
Over a dozen of these zones are used in the test.  Most records present
in these zones are not subsequently used in the test itself, but all of
them need to be signed by the named instances launched by the test,
which puts quite a bit of strain on lower-end machines, leading to
intermittent failures of the "inline" system test.  Remove all redundant
records from the zones used in the "inline" system test in order to
stabilize it.