Tests: fixes and debug info

StackExchange.Redis.Tests/Booksleeve/Scripting.cs

@@ -333,6 +333,7 @@ public void ChangeDbInScript()
                 muxer.GetDatabase(1).StringSet(key, "db 1");
                 muxer.GetDatabase(2).StringSet(key, "db 2");
 
+                Output.WriteLine("Key: " + key);
                 var conn = muxer.GetDatabase(2);
                 var evalResult = conn.ScriptEvaluateAsync(@"redis.call('select', 1)
         return redis.call('get','" + key +"')", null, null);

StackExchange.Redis.Tests/Keys.cs

@@ -18,7 +18,7 @@ public void TestScan()
                 var db = muxer.GetDatabase(dbId);
                 var server = GetAnyMaster(muxer);
                 var prefix = Me();
-                server.FlushDatabase(flags: CommandFlags.FireAndForget);
+                server.FlushDatabase(dbId, flags: CommandFlags.FireAndForget);
 
                 const int Count = 1000;
                 for (int i = 0; i < Count; i++)