Add Docker build for ubuntu18

docker_build/ubuntu18/Dockerfile

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+FROM ubuntu:18.04
+ARG DEBIAN_FRONTEND=noninteractive
+RUN apt-get update && apt-get install -y --no-install-recommends \
+      build-essential \
+      git-all \
+      libpcap-dev \
+      libvirt-dev \
+      libnfnetlink-dev \
+      libxml2-dev \
+      libssl-dev \
+      libdbus-1-dev
+RUN mkdir /packages && chown 777 /packages
+COPY build_hsflowd /root/build_hsflowd
+ENTRYPOINT ["/root/build_hsflowd"]
+
+
+

docker_build/ubuntu18/build_hsflowd

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+#!/bin/bash
+echo "build_hsflowd on platform:  $1"
+
+git clone https://github.com/sflow/host-sflow \
+&& cd host-sflow \
+&& make deb FEATURES="NFLOG PCAP TCP DOCKER KVM OVS DBUS SYSTEMD"
+
+for deb in `ls *.deb`; do cp "$deb" "/packages/${deb/hsflowd/hsflowd-$1}"; done
+echo ""
+echo "files in /packages:"
+ls -l /packages
+