Tune dnsmasq/kubedns limits, replicas, logging

* Add dns_replicas, dns_memory/cpu_limit/requests vars for
dns related apps.
* When kube_log_level=4, log dnsmasq queries as well.
* Add log level control for skydns (part of kubedns app).
* Add limits/requests vars for dnsmasq (part of kubedns app) and
  dnsmasq daemon set.
* Drop string defaults for kube_log_level as it is int and
  is defined in the global vars as well.
* Add docs

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

roles/kubernetes/master/templates/manifests/kube-apiserver.manifest.j2

@@ -41,7 +41,7 @@ spec:
 {% if enable_network_policy is defined and enable_network_policy == True %}
     - --runtime-config=extensions/v1beta1/networkpolicies=true
 {% endif %}
-    - --v={{ kube_log_level | default('2') }}
+    - --v={{ kube_log_level }}
     - --allow-privileged=true
 {% if cloud_provider is defined and cloud_provider == "openstack" %}
     - --cloud-provider={{ cloud_provider }}