Use current AKS Ubuntu 18.04 distro name in e2e tests (#393)

* change ubuntu 18.04 test distro name

* rev orchestratorRelease versions in e2e tests

test/e2e/kubernetes/cniLinux.json

@@ -3,7 +3,7 @@
   "properties":{
      "orchestratorProfile":{
         "orchestratorType":"Kubernetes",
-        "orchestratorRelease":"1.11",
+        "orchestratorRelease":"1.14.6",
         "kubernetesConfig":{
            "networkPlugin":"azure",
            "networkPolicy":"azure",

test/e2e/kubernetes/cniLinux18.json

@@ -3,7 +3,7 @@
   "properties":{
      "orchestratorProfile":{
         "orchestratorType":"Kubernetes",
-        "orchestratorRelease":"1.11",
+        "orchestratorRelease":"1.14.6",
         "kubernetesConfig":{
            "networkPlugin":"azure",
            "networkPolicy":"azure",
@@ -22,7 +22,7 @@
            "count":3,
            "vmSize":"Standard_D2_v2",
 	       "osType": "Linux",
-	       "distro": "aks-18.04", 
+	       "distro": "aks-ubuntu-18.04", 
            "availabilityProfile":"AvailabilitySet"
         }
      ],

test/e2e/kubernetes/cniWindows.json

@@ -3,7 +3,7 @@
    "properties":{
       "orchestratorProfile":{
          "orchestratorType":"Kubernetes",
-         "orchestratorRelease":"1.11",
+         "orchestratorRelease":"1.14.6",
          "kubernetesConfig":{
             "networkPlugin":"azure",
             "networkPolicy":"azure",