Kea should not store anything in /var/kea (LSB violation)

@ondrej complained some time ago about Kea make install creating /var/kea directory and storing files there. This is not conformant to LSB. We should use /var/run/kea instead.

This is somewhat related to #430 and #359 (closed).

Edited Mar 19, 2019 by Tomek Mrugalski

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