Now when we create or drop trigger we check that both trigger name and trigger
table always have database part specified. Thus we give an error if it they
are not specified explicitly or implicitly via current database.


mysql-test/r/trigger.result:
  Added test for bug #14863 "Triggers: crash if create and there is no current
  database".
mysql-test/t/trigger.test:
  Added test for bug #14863 "Triggers: crash if create and there is no current
  database".
sql/sql_trigger.cc:
  mysql_create_or_drop_trigger():
    Now we check that both trigger name and trigger table have database
    part specified (explicitly or implicitly via current database. Note
    that in latter case sp_name::m_db is already set by parser).
  Table_triggers_list::create_trigger()/::add_table_for_trigger():
    Simplified method/function's code since now they can assume that
    sp_name::m_db is always filled now.
  trigname_file_parameters:
    Removed comment which is no longer true.