mongodb_mongod_wiredtiger_cache_max_bytes -> mongodb_ss_wt_cache_maximum_bytes_configured (oldName and newName) (#1023)

* Update v1_compatibility.go

Fixed mess with oldName and newName for mongodb_ss_wt_cache_maximum_bytes_configured

* Update diagnostic_data_collector_test.go

* Update v1_compatibility.go

removed duplicate mongodb_ss_wt_cache_maximum_bytes_configured

* Update diagnostic_data_collector_test.go

* Update v1_compatibility.go

Author: msotnikov

exporter/v1_compatibility.go

@@ -648,10 +648,6 @@ var conversions = []conversion{
 		oldName: "mongodb_mongod_metrics_get_last_error_wtime_total_milliseconds",
 		newName: "mongodb_ss_metrics_getLastError_wtime_totalMillis",
 	},
-	{
-		oldName: "mongodb_ss_wt_cache_maximum_bytes_configured",
-		newName: "mongodb_mongod_wiredtiger_cache_max_bytes",
-	},
 	{
 		oldName: "mongodb_mongod_db_collections_total",
 		newName: "mongodb_dbstats_collections",