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previously the semantics was a bit ambiguous and resulted in some
less predictable behavior. (and, non suprisingly, some usage cases
in features seem to be wrong about "wait for new").

As the only test that is being run in the system tests from xfrin.

The porting is not exact, we don't build the differences in bind9. We
provide them in a database already - we don't want to rely on bind9 and
bind10 can't build differences as of yet from master files (eg.
ixfr-from-differences).

Provide a zone without NS and see it rejects it.

This actually found a bug, maybe unrelated.

Should fail at this time

- introduced the b10-stats daemon running in the lettuce test suite "Xfrin
  incoming notify handling"
- renamed retransfer_master.conf to retransfer_master.conf.orig because of the
  config change in the lettuce suite

test fails because of 1705

and make it possible to print the entire line of output if we see it

and a bit more of a framework to keep track of running processes
(still in the works)
partial support for keeping output files, but no method of triggering that
(we may want to use a specific world.error or something)