Bug #37940    rpl_dual_pos_advance fails sporadically on pushbuild,fail wait_for_slave_to_stop
Bug #37941    rpl_flushlog_loop fails sporadically on pushbuild
  
Several tests fail when waiting for the slave to stop in what
appears to be timeouts caused by a timeout value set to low. 
This causes false failures when the servers are loaded.
  
In order to try to avoid false negatives, we increase the
timeout 10 times and also print some more information in the
event that the slave fails to stop when expected to.
  
We add a printout of the current processes running to be able
to see if any process have been executing for an unexpectedly
long time, and also print the binlog events at the position
indicated by SHOW SLAVE STATUS.


mysql-test/include/wait_for_slave_sql_to_stop.inc:
  - Increasing default timeout 10 times and allowing it to be configurable.
  - Adding printout of process list on failure.
  - Adding printout of binlog events on master that has not yet been applied,
    unless $keep_connection is true.