remove apiVersion of autogen scope from legacy resource definition

Author: leniatgh

schemas/2016-06-01/Microsoft.RecoveryServices.legacy.json

@@ -18,7 +18,6 @@
           "enum": [
             "2018-01-10",
             "2017-07-01",
-            "2016-06-01",
             "2016-05-01",
             "2015-12-15",
             "2015-11-10",