Fix broken regression tests (#5234)

Algorithm.Python/DelistingEventsAlgorithm.py

@@ -39,7 +39,7 @@ class DelistingEventsAlgorithm(QCAlgorithm):
         self.SetEndDate(2007, 5, 25)    #Set End Date
         self.SetCash(100000)             #Set Strategy Cash
         # Find more symbols here: http://quantconnect.com/data
-        self.AddEquity("AAA", Resolution.Daily)
+        self.AddEquity("AAA.1", Resolution.Daily)
         self.AddEquity("SPY", Resolution.Daily)
 
 
@@ -50,7 +50,7 @@ class DelistingEventsAlgorithm(QCAlgorithm):
             data: Slice object keyed by symbol containing the stock data
         '''
         if self.Transactions.OrdersCount == 0:
-            self.SetHoldings("AAA", 1)
+            self.SetHoldings("AAA.1", 1)
             self.Debug("Purchased stock")
 
         for kvp in data.Bars:
@@ -61,7 +61,7 @@ class DelistingEventsAlgorithm(QCAlgorithm):
 
         # the slice can also contain delisting data: data.Delistings in a dictionary string->Delisting
 
-        aaa = self.Securities["AAA"]
+        aaa = self.Securities["AAA.1"]
         if aaa.IsDelisted and aaa.IsTradable:
             raise Exception("Delisted security must NOT be tradable")