Add xml-record-without-id: Detect cases where an record doesn't have xml-id

[moylop260]

Bad

 <?xml version="1.0" ?>
 <odoo noupdate="1">
    <record model="ir.cron">
...

Good

 <?xml version="1.0" ?>
 <odoo noupdate="1">
    <record id="my_id" model="ir.cron">
...

I think the xpath could looks like:

• [odoo or openerp]//record[@id not set] or

• [odoo or openerp]//record and check if id exists from python