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not actually needed in this branch, but it will clarify the idea of
how it will be used in later tasks.

This test is affected by recently added AllocEngine tests. They
will be fixed shortly, but until that happens, CfgMgr.subnet6
test will remain disabled.

Introduction of the ConfigurableClientList::getCachedZoneWriter() method.

To ztable_segment_. The previous could be misunderstood, we have other
segments too.

Conflicts:
	ChangeLog
	src/lib/dhcp/subnet.cc
	src/lib/dhcp/subnet.h
	src/lib/dhcp/tests/subnet_unittest.cc

trivial, directly committing.

The test faked some internal state in an insufficient way.

So the memory client doesn't have to provide an interface to return it.
It was hairy to some extent.

Removing the release from the test, since the segment now destroys it
itself. We can't check all memory is deallocated at that moment in the
test (since we can't do it before the destroy -- it is not deallocated
fully yet, and can't do it after also, since the memory segment doesn't
exist). But that doesn't matter, since the segment checks by assert.