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 }}

roles/kubernetes/master/templates/manifests/kube-controller-manager.manifest.j2

@@ -19,7 +19,7 @@ spec:
     - --service-account-private-key-file={{ kube_cert_dir }}/apiserver-key.pem
     - --root-ca-file={{ kube_cert_dir }}/ca.pem
     - --enable-hostpath-provisioner={{ kube_hostpath_dynamic_provisioner }}
-    - --v={{ kube_log_level | default('2') }}
+    - --v={{ kube_log_level }}
 {% if cloud_provider is defined and cloud_provider == "openstack" %}
     - --cloud-provider={{cloud_provider}}
     - --cloud-config={{ kube_config_dir }}/cloud_config

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

@@ -16,7 +16,7 @@ spec:
     - scheduler
     - --leader-elect=true
     - --master={{ kube_apiserver_endpoint }}
-    - --v={{ kube_log_level | default('2') }}
+    - --v={{ kube_log_level }}
     livenessProbe:
       httpGet:
         host: 127.0.0.1

roles/kubernetes/node/templates/kubelet.j2

@@ -5,7 +5,7 @@ KUBE_LOGGING="--log-dir={{ kube_log_dir }} --logtostderr=true"
 # logging to stderr means we get it in the systemd journal
 KUBE_LOGGING="--logtostderr=true"
 {% endif %}
-KUBE_LOG_LEVEL="--v={{ kube_log_level | default('2') }}"
+KUBE_LOG_LEVEL="--v={{ kube_log_level }}"
 # The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces)
 KUBELET_ADDRESS="--address={{ ip | default("0.0.0.0") }}"
 # The port for the info server to serve on

roles/kubernetes/node/templates/manifests/kube-proxy.manifest.j2

@@ -14,7 +14,7 @@ spec:
     command:
     - /hyperkube
     - proxy
-    - --v={{ kube_log_level | default('2') }}
+    - --v={{ kube_log_level }}
     - --master={{ kube_apiserver_endpoint }}
 {% if not is_kube_master %}
     - --kubeconfig=/etc/kubernetes/node-kubeconfig.yaml