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/extra/rpl_tests/rpl_auto_increment.test

@@ -1,14 +1,6 @@
 #
 # Test of auto_increment with offset
 #
-#####################################
-# By: JBM
-# Date: 2006-02-10
-# Change: NDB does not support auto inc
-# in this usage. Currently there is no
-# plan to implment. Skipping test when
-# NDB is default engine.
-#####################################
 -- source include/not_ndb_default.inc
 -- source include/master-slave.inc
 
@@ -169,7 +161,7 @@ drop table t1;
 # auto_increment fields if the values of them are 0. There is an inconsistency
 # between slave and master. When MODE_NO_AUTO_VALUE_ON_ZERO are masters treat 
 #
-source include/master-slave-reset.inc;
+source include/rpl_reset.inc;
 
 connection master;
 --disable_warnings
@@ -210,12 +202,10 @@ INSERT INTO t2 VALUES(4);
 FLUSH LOGS;
 sync_slave_with_master;
 
-let $diff_table_1= master:test.t1;
-let $diff_table_2= slave:test.t1;
+let $diff_tables= master:t1, slave:t1;
 source include/diff_tables.inc;
 
-let $diff_table_1= master:test.t2;
-let $diff_table_2= slave:test.t2;
+let $diff_tables= master:t2, slave:t2;
 source include/diff_tables.inc;
 
 connection master;
@@ -228,16 +218,16 @@ let $MYSQLD_DATADIR= `SELECT @@DATADIR`;
 --exec $MYSQL_BINLOG $MYSQLD_DATADIR/master-bin.000001 | $MYSQL test
 sync_slave_with_master;
 
-let $diff_table_1= master:test.t1;
-let $diff_table_2= slave:test.t1;
+let $diff_tables= master:t1, slave:t1;
 source include/diff_tables.inc;
 
-let $diff_table_1= master:test.t2;
-let $diff_table_2= slave:test.t2;
+let $diff_tables= master:t2, slave:t2;
 source include/diff_tables.inc;
 
 # End cleanup
+--connection master
 DROP TABLE t1;
 DROP TABLE t2;
 SET SQL_MODE='';
-sync_slave_with_master;
+
+--source include/rpl_end.inc