BUG#49978: Replication tests don't clean up replication state at the end

Major replication test framework cleanup. This does the following:
 - Ensure that all tests clean up the replication state when they
   finish, by making check-testcase check the output of SHOW SLAVE STATUS.
   This implies:
    - Slave must not be running after test finished. This is good
      because it removes the risk for sporadic errors in subsequent
      tests when a test forgets to sync correctly.
    - Slave SQL and IO errors must be cleared when test ends. This is
      good because we will notice if a test gets an unexpected error in
      the slave threads near the end.
    - We no longer have to clean up before a test starts.
 - Ensure that all tests that wait for an error in one of the slave
   threads waits for a specific error. It is no longer possible to
   source wait_for_slave_[sql|io]_to_stop.inc when there is an error
   in one of the slave threads. This is good because:
    - If a test expects an error but there is a bug that causes
      another error to happen, or if it stops the slave thread without
      an error, then we will notice.
    - When developing tests, wait_for_*_to_[start|stop].inc will fail
      immediately if there is an error in the relevant slave thread.
      Before this patch, we had to wait for the timeout.
 - Remove duplicated and repeated code for setting up unusual replication
   topologies. Now, there is a single file that is capable of setting
   up arbitrary topologies (include/rpl_init.inc, but
   include/master-slave.inc is still available for the most common
   topology). Tests can now end with include/rpl_end.inc, which will clean
   up correctly no matter what topology is used. The topology can be
   changed with include/rpl_change_topology.inc.
 - Improved debug information when tests fail. This includes:
    - debug info is printed on all servers configured by include/rpl_init.inc
    - User can set $rpl_debug=1, which makes auxiliary replication files
      print relevant debug info.
 - Improved documentation for all auxiliary replication files. Now they
   describe purpose, usage, parameters, and side effects.
 - Many small code cleanups:
    - Made have_innodb.inc output a sensible error message.
    - Moved contents of rpl000017-slave.sh into rpl000017.test
    - Added mysqltest variables that expose the current state of
      disable_warnings/enable_warnings and friends.
    - Too many to list here: see per-file comments for details.

mysql-test/suite/rpl/r/rpl_row_basic_11bugs.result

@@ -1,9 +1,5 @@
-stop slave;
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
-reset master;
-reset slave;
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
-start slave;
+include/master-slave.inc
+[connection master]
 CREATE DATABASE test_ignore;
 **** On Master ****
 SHOW DATABASES;
@@ -46,11 +42,10 @@ t1
 USE test_ignore;
 ERROR 42000: Unknown database 'test_ignore'
 DROP DATABASE test_ignore;
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
-reset master;
-reset slave;
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
-start slave;
+USE test;
+DROP TABLE t1;
+USE test;
+include/rpl_reset.inc
 CREATE TABLE t1 (a INT);
 DELETE FROM t1;
 INSERT INTO t1 VALUES (1),(2);
@@ -65,11 +60,7 @@ master-bin.000001	#	Write_rows	#	#	table_id: # flags: STMT_END_F
 master-bin.000001	#	Query	#	#	COMMIT
 DROP TABLE t1;
 ================ Test for BUG#17620 ================
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
-reset master;
-reset slave;
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
-start slave;
+include/rpl_reset.inc
 **** On Slave **** 
 SET GLOBAL QUERY_CACHE_SIZE=0;
 **** On Master **** 
@@ -103,12 +94,9 @@ a
 8
 9
 SET GLOBAL QUERY_CACHE_SIZE=0;
+DROP TABLE t1;
 ================ Test for BUG#22550 ================
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
-reset master;
-reset slave;
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
-start slave;
+include/rpl_reset.inc
 CREATE TABLE t1 (a BIT(1), b INT) ENGINE=MYISAM;
 INSERT INTO t1 VALUES(1,2);
 SELECT HEX(a),b FROM t1;
@@ -126,11 +114,7 @@ HEX(a)	b
 0	2
 DROP TABLE IF EXISTS t1;
 ================ Test for BUG#22583 ================
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
-reset master;
-reset slave;
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
-start slave;
+include/rpl_reset.inc
 **** On Master **** 
 CREATE TABLE t1_myisam (k INT, a BIT(1), b BIT(9)) ENGINE=MYISAM;
 CREATE TABLE t1_innodb (k INT, a BIT(1), b BIT(9)) ENGINE=INNODB;
@@ -247,13 +231,8 @@ a	b
 3	1
 4	4
 drop table t1,t2;
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
-reset master;
-reset slave;
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
-start slave;
+include/rpl_reset.inc
 **** On Master ****
-SET SESSION BINLOG_FORMAT=ROW;
 CREATE TABLE t1 (a INT PRIMARY KEY, b SET('master','slave'));
 INSERT INTO t1 VALUES (1,'master,slave'), (2,'master,slave');
 **** On Slave ****
@@ -277,6 +256,6 @@ SELECT * FROM t1 ORDER BY a;
 a	b
 2	master,slave
 5	slave
-DROP TABLE t1;
 **** On Master ****
 DROP TABLE t1;
+include/rpl_end.inc