Move legacy strategy to "broken strats" folder

tests/strategy/strats/broken_strats/legacy_strategy_v1.py

@@ -0,0 +1,30 @@
+# type: ignore
+from pandas import DataFrame
+
+from freqtrade.strategy import IStrategy
+
+
+# Dummy strategy - no longer loads but raises an exception.
+class TestStrategyLegacyV1(IStrategy):
+
+    minimal_roi = {
+        "40": 0.0,
+        "30": 0.01,
+        "20": 0.02,
+        "0": 0.04
+    }
+    stoploss = -0.10
+
+    timeframe = '5m'
+
+    def populate_indicators(self, dataframe: DataFrame) -> DataFrame:
+
+        return dataframe
+
+    def populate_buy_trend(self, dataframe: DataFrame) -> DataFrame:
+
+        return dataframe
+
+    def populate_sell_trend(self, dataframe: DataFrame) -> DataFrame:
+
+        return dataframe