Problem: we use 'sleep 2; wait_for_slave_to_stop;' to reach some slave's states
which is buggy, wasteful of time, platform dependant etc.
Fix: use include/wait_for_slave_***.inc's where it's possible instead.


mysql-test/include/wait_for_slave_io_to_stop.inc:
  Fix for bug #28772: rpl_row_until fails in pushbuild
    - changed to use query_vertical so that it is easier to read the output.
mysql-test/include/wait_for_slave_sql_to_stop.inc:
  Fix for bug #28772: rpl_row_until fails in pushbuild
    - changed to use query_vertical so that it is easier to read the output.
mysql-test/include/wait_for_slave_to_start.inc:
  Fix for bug #28772: rpl_row_until fails in pushbuild
    - changed to use query_vertical so that it is easier to read the output.
mysql-test/include/wait_for_slave_to_stop.inc:
  Fix for bug #28772: rpl_row_until fails in pushbuild
    - changed to use query_vertical so that it is easier to read the output.
mysql-test/t/rpl_row_until.test:
  Fix for bug #28772: rpl_row_until fails in pushbuild
    - 'sleep 2; wait_for_slave_to_stop;' replaced with sourcing
      include/wait_for_slave_sql_to_stop.inc to be more predictable.
mysql-test/t/rpl_stm_until.test:
  Fix for bug #28772: rpl_row_until fails in pushbuild
    - 'sleep 2; wait_for_slave_to_stop;' replaced with sourcing
      include/wait_for_slave_sql_to_stop.inc to be more predictable.