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reviewed by jelte via jabber.

Changes some log message descriptions and some
function arguments and some output.

In particular, the new configuration is merged with the existing
configuration to trigger the full reconfiguration of the server. This is
to satisfy dependencies between various configuration values.

The DHCP6 server had the lease database configuration temporarily
hard-coded.  With the introduction of database configuration
parameters, that is no longer needed.

Also fix some issues from the review.

Before this change, the choice of lease manager was set in
ControlledDhcpv6Srv.  This means that unit tests for that code
always used the MySQL lease manager (if present).  This change
ensures that unit tests always use the Memfile manager.

Parameters are hard-coded for the moment.

- See ControlledDhcpv4Srv class for msgq support.