Fix an issue with zun-cni-daemon building images in aarch64

In the aarch64 image build,
use debian_arch to determine packages of different architectures.

Closes-Bug: #2036874
Change-Id: Ic86e6c22840f658bb68387aac688918d4db1f766

Author: renliang

docker/zun/zun-cni-daemon/Dockerfile.j2

@@ -25,7 +25,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 
 {% block zun_cni_daemon_version %}
 ARG zun_cni_daemon_version=0.7.1
-ARG zun_cni_daemon_url=https://github.com/containernetworking/plugins/releases/download/v${zun_cni_daemon_version}/cni-plugins-amd64-v${zun_cni_daemon_version}.tgz
+ARG zun_cni_daemon_url=https://github.com/containernetworking/plugins/releases/download/v${zun_cni_daemon_version}/cni-plugins-{{debian_arch}}-v${zun_cni_daemon_version}.tgz
 {% endblock %}
 
 COPY zun_sudoers /etc/sudoers.d/kolla_zun_sudoers