crops dockerfile: add pkgs for unittest-xml and netcat

Signed-off-by: Olev Kartau <olev.kartau@intel.com>

Author: okartau

docker/crops-yocto-ubuntu-16/Dockerfile

@@ -14,6 +14,10 @@ ARG gid=1000
 
 USER root
 
+RUN apt-get install -y\
+            netcat-openbsd python3-unittest2 python3-six
+
+
 RUN groupadd -o -g ${gid} ${group} \
 	&& useradd -d "$JENKINS_HOME" -u ${uid} -g ${gid} -m -s /bin/bash ${user}