[PATCH] mysqlcheck wrongly escapes '.' in table names

mysqlcheck encloses dots in a table in backticks, this doesn't make sense though as never expects to see a db.table combination (database and table names are passed in as separate parameters)

This breaks mysqlcheck, and indirectly mysql_upgrade, for tables with a dot in their name

test case:

  CREATE TABLE test.`foo.bar`(id int primary key);

then run

  mysqlcheck test foo.bar

or

  mysql_upgrade --force

This was introduced in revision 1810.3494.1 ( http://bazaar.launchpad.net/~mysql/mysql-server/5.6/revision/1810.3494.1 ) as part of a fix for http://bugs.mysql.com/bug.php?id=30654