Add orc compression codec

Author: Xiaojin Wang

specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Dataset.json

@@ -908,7 +908,8 @@
           "enum": [
             "none",
             "zlib",
-            "snappy"
+            "snappy",
+            "lzo"
           ],
           "x-ms-enum": {
             "name": "orcCompressionCodec",