fix binlog_xa_recover test

1. wait for the binlog thread to reach the certain state, don't use
   a debug_sync that's incorrectly placed to detect the state
2. no need to do a (non-deterministic) `show binlog events` to verify
   what is guaranteed by the directly preceding line

mysql-test/suite/binlog/r/binlog_xa_recover.result

@@ -146,29 +146,12 @@ master-bin.000004	#	Xid	#	#	COMMIT /* XID */
 SET DEBUG_SYNC= "now SIGNAL con10_cont";
 connection con10;
 connection default;
-SET @old_dbug= @@global.DEBUG_DBUG;
-SET GLOBAL debug_dbug="+d,binlog_background_checkpoint_processed";
-SET DEBUG_SYNC= "now WAIT_FOR binlog_background_checkpoint_processed";
 SET DEBUG_SYNC= "now SIGNAL con12_cont";
 connection con12;
 connection default;
-SET GLOBAL debug_dbug= @old_dbug;
 SET DEBUG_SYNC= "now SIGNAL con11_cont";
 connection con11;
 connection default;
-Checking that master-bin.000004 is the last binlog checkpoint
-include/show_binlog_events.inc
-Log_name	Pos	Event_type	Server_id	End_log_pos	Info
-master-bin.000004	#	Format_desc	#	#	SERVER_VERSION, BINLOG_VERSION
-master-bin.000004	#	Gtid_list	#	#	[#-#-#]
-master-bin.000004	#	Binlog_checkpoint	#	#	master-bin.000001
-master-bin.000004	#	Gtid	#	#	BEGIN GTID #-#-#
-master-bin.000004	#	Annotate_rows	#	#	INSERT INTO t1 VALUES (13, NULL)
-master-bin.000004	#	Table_map	#	#	table_id: # (test.t1)
-master-bin.000004	#	Write_rows_v1	#	#	table_id: # flags: STMT_END_F
-master-bin.000004	#	Xid	#	#	COMMIT /* XID */
-master-bin.000004	#	Binlog_checkpoint	#	#	master-bin.000002
-master-bin.000004	#	Binlog_checkpoint	#	#	master-bin.000004
 Now crash the server
 SET SESSION debug_dbug="+d,crash_commit_after_log";
 INSERT INTO t1 VALUES (14, NULL);

mysql-test/suite/binlog/t/binlog_xa_recover.test

@@ -178,14 +178,13 @@ connection default;
 
 # We need to sync the test case with the background processing of the
 # commit checkpoint, otherwise we get nondeterministic results.
-SET @old_dbug= @@global.DEBUG_DBUG;
-SET GLOBAL debug_dbug="+d,binlog_background_checkpoint_processed";
-SET DEBUG_SYNC= "now WAIT_FOR binlog_background_checkpoint_processed";
+let $wait_condition= select count(*) = 1 from performance_schema.threads where processlist_state = "Waiting for background binlog tasks";
+--source include/wait_condition.inc
+
 SET DEBUG_SYNC= "now SIGNAL con12_cont";
 connection con12;
 reap;
 connection default;
-SET GLOBAL debug_dbug= @old_dbug;
 
 SET DEBUG_SYNC= "now SIGNAL con11_cont";
 connection con11;
@@ -199,9 +198,6 @@ connection default;
 --let $condition= = "master-bin.000004"
 --source include/wait_show_condition.inc
 
---echo Checking that master-bin.000004 is the last binlog checkpoint
---source include/show_binlog_events.inc
-
 --echo Now crash the server
 # It is not too easy to test XA recovery, as it runs early during server
 # startup, before any connections can be made.

mysql-test/suite/binlog_encryption/binlog_xa_recover.result

@@ -151,30 +151,12 @@ master-bin.000004	#	Xid	#	#	COMMIT /* XID */
 SET DEBUG_SYNC= "now SIGNAL con10_cont";
 connection con10;
 connection default;
-SET @old_dbug= @@global.DEBUG_DBUG;
-SET GLOBAL debug_dbug="+d,binlog_background_checkpoint_processed";
-SET DEBUG_SYNC= "now WAIT_FOR binlog_background_checkpoint_processed";
 SET DEBUG_SYNC= "now SIGNAL con12_cont";
 connection con12;
 connection default;
-SET GLOBAL debug_dbug= @old_dbug;
 SET DEBUG_SYNC= "now SIGNAL con11_cont";
 connection con11;
 connection default;
-Checking that master-bin.000004 is the last binlog checkpoint
-include/show_binlog_events.inc
-Log_name	Pos	Event_type	Server_id	End_log_pos	Info
-master-bin.000004	#	Format_desc	#	#	SERVER_VERSION, BINLOG_VERSION
-master-bin.000004	#	Start_encryption	#	#	
-master-bin.000004	#	Gtid_list	#	#	[#-#-#]
-master-bin.000004	#	Binlog_checkpoint	#	#	master-bin.000001
-master-bin.000004	#	Gtid	#	#	BEGIN GTID #-#-#
-master-bin.000004	#	Annotate_rows	#	#	INSERT INTO t1 VALUES (13, NULL)
-master-bin.000004	#	Table_map	#	#	table_id: # (test.t1)
-master-bin.000004	#	Write_rows_v1	#	#	table_id: # flags: STMT_END_F
-master-bin.000004	#	Xid	#	#	COMMIT /* XID */
-master-bin.000004	#	Binlog_checkpoint	#	#	master-bin.000002
-master-bin.000004	#	Binlog_checkpoint	#	#	master-bin.000004
 Now crash the server
 SET SESSION debug_dbug="+d,crash_commit_after_log";
 INSERT INTO t1 VALUES (14, NULL);