dockers: Add DHCP Relay docker (#38)

dockers/docker-dhcp-relay/Dockerfile

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+FROM docker-base
+
+## Make apt-get non-interactive
+ENV DEBIAN_FRONTEND=noninteractive
+
+## Install isc-dhcp-relay
+## Clean up
+RUN apt-get update && apt-get -y install \
+    isc-dhcp-relay &&        \
+    apt-get clean -y; apt-get autoclean -y; apt-get autoremove -y
+
+COPY isc-dhcp-relay /etc/default/isc-dhcp-relay
+
+ENTRYPOINT service rsyslog start    \
+    && service isc-dhcp-relay start \
+    && /bin/bash
+

dockers/docker-dhcp-relay/isc-dhcp-relay

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+SERVERS=""
+
+INTERFACES=""
+
+#-a provides option 82 circuit id information
+OPTIONS="-a"