Added DDL logging to applier and replaying also so that
DDL is logged on other than originating node.

wsrep.h
	Removed wsrep_thd_is_local conditions and cleaned up
	the macros. Removed WSREP_TO_ISOLATION_END.

Event_job_data::execute
change_password
acl_set_default_role
mysql_execute_command
	Replaced macro by function call

wsrep_to_isolation_begin
wsrep_to_isolation_end
	If execution is not local log DDL-information when
	wsrep_debug is enabled

No new tests required as current regression setting is
already testing these code paths.