Remove kubernetes-cni package from AMI

This is now being bundled in the `kubelet` package, see:
kubernetes/release#1309.

stack/ami/debian/build.json

@@ -9,7 +9,6 @@
     "var-log-vol": "xvdf",
     "docker-version": "5:18.09.9~3-0~debian-buster",
     "k8s-version": "",
-    "cni-version": "0.7.5",
     "share-accounts": "all",
     "base-ami-pattern": "debian-stretch-hvm-x86_64-gp2-*",
     "base-ami-owner": "379101102735",
@@ -91,7 +90,6 @@
       "docker:version": "{{ user `docker-version` }}",
       "k8s:version": "{{ user `k8s-version` }}",
       "keights:version": "{{ user `keights-version` }}",
-      "cni:version": "{{ user `cni-version` }}"
     },
 
     "run_tags": {
@@ -121,7 +119,6 @@
 	"-e", "docker_version={{ user `docker-version` }}",
 	"-e", "k8s_version={{ user `k8s-version` }}",
 	"-e", "keights_version={{ user `keights-version` }}",
-	"-e", "cni_version={{ user `cni-version` }}",
 	"-e", "debian_release={{ user `debian-release` }}"
       ]
     }

stack/ami/debian/playbook.yml

@@ -180,7 +180,6 @@
           openssh-server \
           docker-ce={{ docker_version }} \
           docker-ce-cli={{ docker_version }} \
-          kubernetes-cni={{ cni_version }}-00 \
           kubectl={{ k8s_version_no_v }}-00 \
           kubeadm={{ k8s_version_no_v }}-00 \
           kubelet={{ k8s_version_no_v }}-00 && \