XXX: hard-code the dataplane version in the haproxy docker build.

git checkout with the Dockerfile ARG for the version tag apparently
wasn't working, so the latest version was checked out and built.
That version currently doesn't work in the haproxy container, so
the container did not come up.

container/Dockerfile.haproxy

@@ -16,8 +16,11 @@ RUN go get -d -v github.com/slimhazard/gogitversion && \
 RUN cd /go && git clone https://code.uplex.de/k8s/k8s-crt-dnldr.git && \
     cd /go/k8s-crt-dnldr && make k8s-crt-dnldr
 
+# RUN cd /go && git clone https://github.com/haproxytech/dataplaneapi.git && \
+#    cd /go/dataplaneapi && git checkout ${dataplane_version} && make build
+
 RUN cd /go && git clone https://github.com/haproxytech/dataplaneapi.git && \
-    cd /go/dataplaneapi && git checkout ${dataplane_version} && make build
+    cd /go/dataplaneapi && git checkout v2.3.1 && make build
 
 # Build haproxy
 FROM debian:${debian_tag}