Allow subdomains of dns_domain and fix kubelet restarts

* Add a var for ndots (default 5) and put it hosts' /etc/resolv.conf.
* Poke kube dns container image to v1.7
* In order to apply changes to kubelet, notify it to
be restarted on changes made to /etc/resolv.conf. Ignore errors as the kubelet
may yet to be present up to the moment of the notification being processed.
* Remove unnecessary kubelet restart for master role as the node role ensures
it is up and running. Notify master static pods waiters for apiserver,
scheduler, controller-manager instead.

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

roles/dnsmasq/handlers/main.yml

@@ -17,5 +17,18 @@
   when: ansible_os_family != "RedHat" and ansible_os_family != "CoreOS"
 
 - name: Dnsmasq | update resolvconf
+  command: /bin/true
+  notify:
+    - Dnsmasq | reload resolvconf
+    - Dnsmasq | reload kubelet
+
+- name: Dnsmasq | reload resolvconf
   command: /sbin/resolvconf -u
   ignore_errors: true
+
+- name: Dnsmasq | reload kubelet
+  service:
+    name: kubelet
+    state: restarted
+  when: "{{ inventory_hostname in groups['kube-master'] }}"
+  ignore_errors: true