Split keactrl test config file

keactrl tests use a Kea config file with all (i.e. DHCP4, DHCP6, D2, CA and Logging) entries.

The support of this feature will be obsoleted ASAP and of course do not work at all with netconf. This file and corresponding function in testutils must be split. BTW no need to do this now...

Edited Dec 06, 2018 by Tomek Mrugalski

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