Add bot_name setting

allows naming the bot to simply differentiate when running different
bots.

freqtrade/rpc/rpc.py

@@ -129,6 +129,7 @@ class RPC:
             'trailing_stop_positive': config.get('trailing_stop_positive'),
             'trailing_stop_positive_offset': config.get('trailing_stop_positive_offset'),
             'trailing_only_offset_is_reached': config.get('trailing_only_offset_is_reached'),
+            'bot_name': config.get('bot_name', 'freqtrade'),
             'timeframe': config.get('timeframe'),
             'timeframe_ms': timeframe_to_msecs(config['timeframe']
                                                ) if 'timeframe' in config else '',