Refactor downloads to use download role directly (#1824)

* Refactor downloads to use download role directly

Also disable fact delegation so download delegate works acros OSes.

* clean up bools and ansible_os_family conditionals

roles/kubernetes/node/meta/main.yml

@@ -1,91 +1,6 @@
 ---
 dependencies:
-  - role: download
-    file: "{{ downloads.hyperkube }}"
-    tags:
-      - download
-      - hyperkube
-      - kubelet
-      - network
-      - canal
-      - calico
-      - weave
-      - kube-controller-manager
-      - kube-scheduler
-      - kube-apiserver
-      - kube-proxy
-      - kubectl
-
-  - role: download
-    file: "{{ downloads.pod_infra }}"
-    tags:
-      - download
-      - kubelet
-
-  - role: download
-    file: "{{ downloads.install_socat }}"
-    when: ansible_os_family in ['CoreOS', 'Container Linux by CoreOS']
-    tags:
-      - download
-      - kubelet
-
-  - role: download
-    file: "{{ downloads.kubeadm }}"
-    when: kubeadm_enabled
-    tags:
-      - download
-      - kubelet
-      - kubeadm
-
   - role: kubernetes/secrets
     when: not kubeadm_enabled
     tags:
       - k8s-secrets
-  - role: download
-    file: "{{ downloads.nginx }}"
-    tags:
-      - download
-      - nginx
-
-  - role: download
-    file: "{{ downloads.testbox }}"
-    tags:
-      - download
-
-  - role: download
-    file: "{{ downloads.netcheck_server }}"
-    when: deploy_netchecker
-    tags:
-      - download
-      - netchecker
-
-  - role: download
-    file: "{{ downloads.netcheck_agent }}"
-    when: deploy_netchecker
-    tags:
-      - download
-      - netchecker
-
-  - role: download
-    file: "{{ downloads.kubedns }}"
-    tags:
-      - download
-      - dnsmasq
-
-  - role: download
-    file: "{{ downloads.dnsmasq_nanny }}"
-    tags:
-      - download
-      - dnsmasq
-
-  - role: download
-    file: "{{ downloads.dnsmasq_sidecar }}"
-    tags:
-      - download
-      - dnsmasq
-
-  - role: download
-    file: "{{ downloads.kubednsautoscaler }}"
-    tags:
-      - download
-      - dnsmasq