sp_grant_privileges(), the function that GRANTs EXECUTE + ALTER privs on a SP,
did so creating a user-entry with not password; mysql_routine_grant() would then
write that "change" to the user-table.


mysql-test/r/sp-security.result:
  prove that creating a stored procedure will not destroy the creator's password
mysql-test/t/sp-security.test:
  prove that creating a stored procedure will not destroy the creator's password
sql/sql_acl.cc:
  get password from ACLs, convert to correct format, and use it when
  forcing GRANTS for SPs