Revert "Making rule priority a required field (Azure#19007)"

This reverts commit b6cfe05.

Author: vinaymundada27

specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/applicationGateway.json

@@ -2396,9 +2396,6 @@
           "description": "The provisioning state of the request routing rule resource."
         }
       },
-      "required": [
-        "priority"
-      ],
       "description": "Properties of request routing rule of the application gateway."
     },
     "ApplicationGatewayRequestRoutingRule": {

specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ApplicationGatewayCreate.json

@@ -559,7 +559,6 @@
               "properties": {
                 "provisioningState": "Succeeded",
                 "ruleType": "Basic",
-                "priority": 10,
                 "httpListener": {
                   "id": "/subscriptions/subid/resourceGroups/rg1/providers/Microsoft.Network/applicationGateways/appgw/httpListeners/appgwhl"
                 },
@@ -583,7 +582,6 @@
               "properties": {
                 "provisioningState": "Succeeded",
                 "ruleType": "PathBasedRouting",
-                "priority": 20,
                 "httpListener": {
                   "id": "/subscriptions/subid/resourceGroups/rg1/providers/Microsoft.Network/applicationGateways/appgw/httpListeners/appgwhttplistener"
                 },
@@ -902,7 +900,6 @@
               "properties": {
                 "provisioningState": "Succeeded",
                 "ruleType": "Basic",
-                "priority": 10,
                 "httpListener": {
                   "id": "/subscriptions/subid/resourceGroups/rg1/providers/Microsoft.Network/applicationGateways/appgw/httpListeners/appgwhl"
                 },
@@ -925,7 +922,6 @@
               "id": "/subscriptions/subid/resourceGroups/rg1/providers/Microsoft.Network/applicationGateways/appgw/requestRoutingRules/appgwPathBasedRule",
               "properties": {
                 "provisioningState": "Succeeded",
-                "priority": 20,
                 "ruleType": "PathBasedRouting",
                 "httpListener": {
                   "id": "/subscriptions/subid/resourceGroups/rg1/providers/Microsoft.Network/applicationGateways/appgw/httpListeners/appgwhttplistener"

specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ApplicationGatewayList.json

@@ -104,7 +104,6 @@
                   "name": "appgwrule",
                   "properties": {
                     "ruleType": "Basic",
-                    "priority": 10,
                     "httpListener": {
                       "id": "/subscriptions/subid/resourceGroups/rg1/providers/Microsoft.Network/applicationGateways/appgw/httpListeners/appgwhl"
                     },

specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ApplicationGatewayListAll.json

@@ -103,7 +103,6 @@
                   "name": "appgwrule",
                   "properties": {
                     "ruleType": "Basic",
-                    "priority": 10,
                     "httpListener": {
                       "id": "/subscriptions/subid/resourceGroups/rg1/providers/Microsoft.Network/applicationGateways/appgw/httpListeners/appgwhl"
                     },

specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ApplicationGatewayUpdateTags.json

@@ -127,7 +127,6 @@
               "properties": {
                 "provisioningState": "Succeeded",
                 "ruleType": "Basic",
-                "priority": 10,
                 "httpListener": {
                   "id": "/subscriptions/subid/resourceGroups/rg1/providers/Microsoft.Network/applicationGateways/AppGw/httpListeners/listener1"
                 },