message: extract SkuTier as seperate definition for common-types/v3.json
diff: },
  "x-ms-azure-resource": true
  },
  - "Sku": {
  - "description": "The resource model definition representing SKU",
  - "type": "object",
  - "properties": {
  - "name": {
  - "type": "string",
  - "description": "The name of the SKU. Ex - P3. It is typically a letter+number code"
  - },
  - "tier": {
  + "SkuTier": {
  "type": "string",
  "enum": [
  "Free",
  },
  "description": "This field is required to be implemented by the Resource Provider if the service has more than one tier, but is not required on a PUT."
  },
  + "Sku": {
  + "description": "The resource model definition representing SKU",
  + "type": "object",
  + "properties": {
  + "name": {
  + "type": "string",
  + "description": "The name of the SKU. Ex - P3. It is typically a letter+number code"
  + },
  + "tier": {
  + "$ref": "#/definitions/SkuTier"
  + },
  "size": {
  "type": "string",
  "description": "The SKU size. When the name field is the combination of tier and some other value, this would be the standalone code. "
  