Conflicts:
	Knot.files
	src/knot/nameserver/update.c
	src/knot/zone/zone-load.c
	src/knot/zone/zone.c
	src/knot/zone/zone.h

dnssec: no diff on initial load

The zone contents is empty on first load, therefore ixfr-from-differences failed to write the changes to the journal.

- tests adjusted