Introduce dns_mode and resolvconf_mode and implement docker_dns mode

Also update reset.yml to do more dns/network related cleanup.

roles/dnsmasq/defaults/main.yml

@@ -18,9 +18,6 @@ dnsmasq_version: 2.72
 dnsmasq_image_repo: "andyshinn/dnsmasq"
 dnsmasq_image_tag: "{{ dnsmasq_version }}"
 
-# Skip dnsmasq setup
-skip_dnsmasq: false
-
 # Limits for dnsmasq/kubedns apps
 dns_cpu_limit: 100m
 dns_memory_limit: 170Mi

roles/dnsmasq/meta/main.yml

@@ -2,5 +2,5 @@
 dependencies:
   - role: download
     file: "{{ downloads.dnsmasq }}"
-    when: not skip_dnsmasq|default(false) and download_localhost|default(false)
+    when: dns_mode == 'dnsmasq_kubedns' and download_localhost|default(false)
     tags: [download, dnsmasq]