Remove old files, fix tagging

data/Dockerfiles/pdns/Dockerfile

@@ -1,26 +0,0 @@
-FROM ubuntu:xenial
-MAINTAINER Andre Peters <andre.peters@debinux.de>
-
-ENV DEBIAN_FRONTEND noninteractive
-ENV LC_ALL C
-
-RUN dpkg-divert --local --rename --add /sbin/initctl \
-    && ln -sf /bin/true /sbin/initctl \
-    && dpkg-divert --local --rename --add /usr/bin/ischroot \
-    && ln -sf /bin/true /usr/bin/ischroot
-
-RUN echo 'deb http://repo.powerdns.com/ubuntu xenial-rec-40 main' > /etc/apt/sources.list.d/pdns.list
-
-RUN echo 'Package: pdns-*\n\
-Pin: origin repo.powerdns.com\n\
-Pin-Priority: 600\n' > /etc/apt/preferences.d/pdns
-
-RUN apt-key adv --fetch-keys http://repo.powerdns.com/FD380FBB-pub.asc \
-	&& apt-get update \
-	&& apt-get install -y --force-yes pdns-recursor
-
-CMD ["/usr/sbin/pdns_recursor"]
-
-EXPOSE 53/udp
-
-RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*