Kea dhcp-server in docker v1.3.0

Kea is an opensource high-performance, extensible DHCP server engine that is designed to be easily modified and extended with hooks libraries.

This release was made for testing purposes only and not intended for production use

TBD:

1. Make packages compliant with debian policy
2. Add kea-shell
3. Add sources for experimental hook plugin
4. Get rid of *.deb binaries and make them compiled during docker image baking.