Make dnsmasq daemon set optional

Change additional dnsmasq opts:
- Adjust caching size and TTL
- Disable resolve conf to not create loops
- Change dnsPolicy to default (similarly to kubedns's dnsmasq). The
  ClusterFirst should not be used to not create loops
- Disable negative NXDOMAIN replies to be cached
- Make its very installation as optional step (enabled by default).
  If you don't want more than 3 DNS servers, including 1 for K8s, disable
  it.
- Add docs and a drawing to clarify DNS setup.
- Fix stdout logs for dnsmasq/kubedns app configs
- Add missed notifies to resolvconf -u handler
- Fix idempotency of resolvconf head file changes

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

roles/dnsmasq/tasks/dnsmasq.yml

@@ -0,0 +1,58 @@
+---
+- name: ensure dnsmasq.d directory exists
+  file:
+    path: /etc/dnsmasq.d
+    state: directory
+
+- name: ensure dnsmasq.d-available directory exists
+  file:
+    path: /etc/dnsmasq.d-available
+    state: directory
+
+- name: Write dnsmasq configuration
+  template:
+    src: 01-kube-dns.conf.j2
+    dest: /etc/dnsmasq.d-available/01-kube-dns.conf
+    mode: 0755
+    backup: yes
+
+- name: Stat dnsmasq configuration
+  stat: path=/etc/dnsmasq.d/01-kube-dns.conf
+  register: sym
+
+- name: Move previous configuration
+  command: mv /etc/dnsmasq.d/01-kube-dns.conf /etc/dnsmasq.d-available/01-kube-dns.conf.bak
+  changed_when: False
+  when: sym.stat.islnk is defined and sym.stat.islnk == False
+
+- name: Enable dnsmasq configuration
+  file:
+    src: /etc/dnsmasq.d-available/01-kube-dns.conf
+    dest: /etc/dnsmasq.d/01-kube-dns.conf
+    state: link
+
+- name: Create dnsmasq manifests
+  template: src={{item.file}} dest=/etc/kubernetes/{{item.file}}
+  with_items:
+    - {file: dnsmasq-ds.yml, type: ds}
+    - {file: dnsmasq-svc.yml, type: svc}
+  register: manifests
+  when: inventory_hostname == groups['kube-master'][0]
+
+- name: Start Resources
+  kube:
+    name: dnsmasq
+    namespace: kube-system
+    kubectl: "{{bin_dir}}/kubectl"
+    resource: "{{item.item.type}}"
+    filename: /etc/kubernetes/{{item.item.file}}
+    state: "{{item.changed | ternary('latest','present') }}"
+  with_items: "{{ manifests.results }}"
+  when: inventory_hostname == groups['kube-master'][0]
+
+- name: Check for dnsmasq port (pulling image and running container)
+  wait_for:
+    host: "{{dns_server}}"
+    port: 53
+    delay: 5
+  when: inventory_hostname == groups['kube-node'][0]