Fix resolv.conf search/nameserver

* Ensure additional nameserver/search, if defined as vars.
* Don't backup changed dhclient hooks as they are going to be
  executed by dhclient as well, which is not what we want.
* For debian OS family only:
- Rename nodnsupdate hook the resolvconf hook to be sourced always
before it.
- Ensure dhclient restarted via network restart to apply the
nodnsupdate hook.
* For rhel OS family, the fix TBD, it doesn't work the same way.

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

roles/dnsmasq/handlers/main.yml

@@ -0,0 +1,10 @@
+- name: Dnsmasq | restart network
+  service:
+    name: >-
+      {% if ansible_os_family == "RedHat" -%}
+      network
+      {%- elif ansible_os_family == "Debian" -%}
+      networking
+      {%- endif %}
+    state: restarted
+  when: ansible_os_family != "CoreOS"