Dev gubalasu frontdoor microsoft.network 2021 06 01 (#19578)

* Adds base for updating Microsoft.Network from version stable/2020-05-01 to version 2021-06-01

* Updates readme

* Updates API version in new specs and examples

* update waf configs and examples from 2020-11-01

* Update api version in new specs and examples

* Migration api update

* Update readme

* Fix readme

* update readme

* Fix readme again

* Fix readme

* Fix readme

* update waf policy provisioning state

Author: gubalasu

specification/frontdoor/resource-manager/Microsoft.Network/stable/2021-06-01/assets/frontdoor.svg

@@ -0,0 +1,18 @@
+{
+  "parameters": {
+    "api-version": "2021-06-01",
+    "checkFrontDoorNameAvailabilityInput": {
+      "name": "sampleName",
+      "type": "Microsoft.Network/frontDoors"
+    }
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "nameAvailability": "Unavailable",
+        "reason": "Name is already in use",
+        "message": "Name not available"
+      }
+    }
+  }
+}

specification/frontdoor/resource-manager/Microsoft.Network/stable/2021-06-01/examples/CheckFrontdoorNameAvailability.json

@@ -0,0 +1,19 @@
+{
+  "parameters": {
+    "api-version": "2021-06-01",
+    "subscriptionId": "subid",
+    "checkFrontDoorNameAvailabilityInput": {
+      "name": "sampleName",
+      "type": "Microsoft.Network/frontDoors/frontendEndpoints"
+    }
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "nameAvailability": "Unavailable",
+        "reason": "Name is already in use",
+        "message": "Name not available"
+      }
+    }
+  }
+}