typos in ChangeLog fixed

it's not generated anymore.

Conflicts:
	src/lib/datasrc/client_list.h

it doesn't make sense in practice and should better be cleaned up.

test cases were adjusted.  in particular, test_do_axfrin_nozone_sqlite3
was simply removed; it's okay as it only intended to the old behavior
itself.

from this point, xfrin stops auto-create a new zone; the admin must explicitly
create empty zone using b10-loadzone -e.

this is a backward compatible change, and is currently no-op in effect, but
will be crucial with main changes of this branch that are coming.

it'll soon be impossible to assume a specific data source for the very
initial transfer, we need to extract the zone creation part from b10-xfrin
(which should be the right course anyway).  the new loadzone option is
my proposed way to do this.  I think this option itself is of some use, too.

Also make the memory segment tests run only where shared memory is available.

Conflicts:
	src/lib/datasrc/memory/zone_table.cc
	src/lib/datasrc/memory/zone_writer.cc
	src/lib/datasrc/memory/zone_writer.h

we're going to use stored client retrieved from a client list.  at that point
we need to ensure zone finders are only used by a single thread (updaters can
run concurrently by multiple threads).

no behavior change.

this is already unused and has been effectively dead code.