Adjust Config.Get to just log in debug mode

[Martin-Molinero]

• Config.Get logs a lot, adjust it only to log in debug mode. For example the following should be debug mode:

 TRACE:: Config.Get(): Configuration key not found. Key: transaction-handler - Using default value: BacktestingTransactionHandler
 TRACE:: Config.Get(): Configuration key not found. Key: real-time-handler - Using default value: BacktestingRealTimeHandler
 TRACE:: Config.Get(): Configuration key not found. Key: data-feed-handler - Using default value: FileSystemDataFeed
 TRACE:: Config.Get(): Configuration key not found. Key: data-permission-manager - Using default value: DataPermissionManager