message: EventHub: Add Premium to EventHub SKU name and tier enums
diff: "description": "Name of this SKU.",
  "enum": [
  "Basic",
  - "Standard"
  + "Standard",
  + "Premium"
  ],
  "x-ms-enum": {
  "name": "SkuName",
  "description": "The billing tier of this particular SKU.",
  "enum": [
  "Basic",
  - "Standard"
  + "Standard",
  + "Premium"
  ],
  "x-ms-enum": {
  "name": "SkuTier",
  "maximum": 20,
  "minimum": 0,
  "type": "integer",
  - "description": "The Event Hubs throughput units, value should be 0 to 20 throughput units."
  + "description": "The Event Hubs throughput units for Basic or Standard tiers, where value should be 0 to 20 throughput units. The Event Hubs premium units for Premium tier, where value should be 0 to 10 premium units."
  }
  },
  "required": [
  