This allows us to avoid calculating variables (including those involving mutex) that doesn't match the given
wildcard in SHOW STATUS LIKE '...'
Removed all references to active_mi that could cause problems for multi-source replication.

Added START|STOP ALL SLAVES
Added SHOW ALL SLAVES STATUS


include/mysql/plugin.h:
  Added SHOW_SIMPLE_FUNC
include/mysql/plugin_audit.h.pp:
  Updated .pp file
include/mysql/plugin_auth.h.pp:
  Updated .pp file
include/mysql/plugin_ftparser.h.pp:
  Updated .pp file
mysql-test/suite/multi_source/info_logs.result:
  New columns in SHOW ALL SLAVES STATUS
mysql-test/suite/multi_source/info_logs.test:
  Test new syntax
mysql-test/suite/multi_source/simple.result:
  New columns in SHOW ALL SLAVES STATUS
mysql-test/suite/multi_source/simple.test:
  test new syntax
mysql-test/suite/multi_source/syntax.result:
  Updated result
mysql-test/suite/multi_source/syntax.test:
  Test new syntax
mysql-test/suite/rpl/r/rpl_skip_replication.result:
  Updated result
plugin/semisync/semisync_master_plugin.cc:
  SHOW_FUNC -> SHOW_SIMPLE_FUNC
sql/item_create.cc:
  Simplify code
sql/lex.h:
  Added SLAVES keyword
sql/log.cc:
  Constant -> define
sql/log_event.cc:
  Added comment
sql/mysqld.cc:
  SHOW_FUNC -> SHOW_SIMPLE_FUNC
  Made slave_retried_trans, slave_received_heartbeats and heartbeat_period multi-source safe
  Clear variable denied_connections and slave_retried_transactions on startup
sql/mysqld.h:
  Added slave_retried_transactions
sql/rpl_mi.cc:
  create_signed_file_name -> create_logfile_name_with_suffix
  Added start_all_slaves() and stop_all_slaves()
sql/rpl_mi.h:
  Added prototypes
sql/rpl_rli.cc:
  create_signed_file_name -> create_logfile_name_with_suffix
  added executed_entries
sql/rpl_rli.h:
  Added executed_entries
sql/share/errmsg-utf8.txt:
  More and better error messages
sql/slave.cc:
  Added more fields to SHOW ALL SLAVES STATUS
  Added slave_retried_transactions
  Changed constants -> defines
sql/sql_class.h:
  Added comment
sql/sql_insert.cc:
  active_mi.rli -> thd->rli_slave
sql/sql_lex.h:
  Added SQLCOM_SLAVE_ALL_START & SQLCOM_SLAVE_ALL_STOP
sql/sql_load.cc:
  active_mi.rli -> thd->rli_slave
sql/sql_parse.cc:
  Added START|STOP ALL SLAVES
sql/sql_prepare.cc:
  Added SQLCOM_SLAVE_ALL_START & SQLCOM_SLAVE_ALL_STOP
sql/sql_reload.cc:
  Made REFRESH RELAY LOG multi-source safe
sql/sql_repl.cc:
  create_signed_file_name -> create_logfile_name_with_suffix
  Don't send my_ok() from start_slave() or stop_slave() so that we can call it for all master connections
sql/sql_show.cc:
  Compare wild cards early for all variables
sql/sql_yacc.yy:
  Added START|STOP ALL SLAVES
  Added SHOW ALL SLAVES STATUS
sql/sys_vars.cc:
  Made replicate_events_marked_for_skip,slave_net_timeout and rpl_filter multi-source safe.
sql/sys_vars.h:
  Simplify Sys_var_rpl_filter