remove GTEST_LDADD
as discussed on jabber
the benchmark tool doesn't use googletest

getenv requires include of stdlib.h in src/bin/d2/d2_controller.cc

classes to bin/src/D2.

controller bool methods.

typos in ChangeLog fixed

now b10-dhcp-ddns.

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.