Update acceptance tests to use core-dns

Signed-off-by: JoshVanL <vleeuwenjoshua@gmail.com>

puppet/modules/kubernetes_addons/templates/metrics-server.yaml.erb

@@ -1,5 +1,4 @@
 # This file should be kept in sync with https://github.com/kubernetes-incubator/metrics-server/tree/master/deploy
----
 apiVersion: apiregistration.k8s.io/v1beta1
 kind: APIService
 metadata:

puppet/modules/tarmak/spec/acceptance/single_node_spec.rb

@@ -20,6 +20,16 @@
     ENV['KUBERNETES_AUTHORIZATION_MODE'] || '[]'
   end
 
+  if Gem::Version.new(ENV['KUBERNETES_VERSION']) >= Gem::Version.new('1.10.0')
+    let :dns_name do
+      'core'
+    end
+  else
+    let :dns_name do
+      'kube'
+    end
+  end
+
   context 'single node with master + worker components' do
     let :cluster_name do
       'test'
@@ -111,15 +121,15 @@
     end
 
     it 'should have three ready dns pods', :retry => 20, :retry_wait => 5 do
-      result = shell('kubectl get pods --namespace kube-system -l k8s-app=kube-dns')
+      result = shell("kubectl get pods --namespace kube-system -l k8s-app=#{dns_name}-dns")
       logger.notify "kubectl get pods:\n#{result.stdout}"
       expect(result.exit_code).to eq(0)
       expect(result.stdout.scan(/Running/m).size).to eq(3)
-      expect(result.stdout.scan(/(4\/4|3\/3)/m).size).to eq(3)
+      expect(result.stdout.scan(/(4\/4|3\/3|1\/1)/m).size).to eq(3)
     end
 
     it 'should have a ready dns autoscaler pod', :retry => 20, :retry_wait => 5 do
-      result = shell('kubectl get pods --namespace kube-system -l k8s-app=kube-dns-autoscaler')
+      result = shell("kubectl get pods --namespace kube-system -l k8s-app=#{dns_name}-dns-autoscaler")
       logger.notify "kubectl get pods:\n#{result.stdout}"
       expect(result.exit_code).to eq(0)
       expect(result.stdout.scan(/Running/m).size).to eq(1)