OK sthen

so that the changed default will be pointed out to the admin by
sysmerge.
Idea & OK sthen

subdirectories (/var/nsd/zones/{master,slave}) and create these in mtree.
Nearly everybody that uses NSD for slave zones that I talked to already has
this layout. Bikesh^Wdiscussed with ajacoutot florian millert and others.
ok ajacoutot@ florian@ phessler@ claudio@ jung@

and zone xfers.  OK florian@ deraadt@

use case.
sthen@ noticed a problem with missing records on shutdown.
OK sthen@

rename key1 to tsig1 to clearly identify this name as a transaction
signature digest; consistently use tsig key name on slave zone.
ok jakob@