Fix the parser to make the database options not optional.


mysql-test/r/information_schema.result:
  Update results (Bug#25859)
mysql-test/t/information_schema.test:
  Add a test case for Bug#25859 "ALTER DATABASE works w/o parameters"
sql/sql_yacc.yy:
  Fix Bug#25859 ALTER DATABASE works w/o parameters - require
  parameters in the parser.