Fix references to deleted 2014-06-01 schema

Author: anthony-c-martin

generator/resources.json

@@ -7175,7 +7175,6 @@
     "2020-02-14"
   ],
   "Microsoft.Web/certificates": [
-    "2014-06-01",
     "2015-08-01",
     "2016-03-01",
     "2018-02-01",
@@ -7206,7 +7205,6 @@
     "2018-02-01"
   ],
   "Microsoft.Web/serverfarms": [
-    "2014-06-01",
     "2015-08-01",
     "2016-09-01",
     "2018-02-01"
@@ -7220,7 +7218,6 @@
     "2018-02-01"
   ],
   "Microsoft.Web/sites": [
-    "2014-06-01",
     "2015-08-01",
     "2016-08-01",
     "2018-02-01",