erp5.util.testbrowser: Refactor of openNoVisit() and {Image,Submit}Control for recent zope.testbrowser (followup of 5a0b3763).

And specifically, Domains (more portal types may be added to the relation
string field widget as needed).
Predicates get expanded to the list of documents they match.

Can be used to identify whether a document should be used to match other
documents, rather than as a final document itself.

Reorganize code by parsing the appcache with jio.

Interface checking is done by a standalone gadget whch directly display the status.

Drop not needed code (do not reimplement getInterfaceList for example).

Force interface strict HTML format

/reviewed-on nexedi/erp5!706

/reviewed-on nexedi/erp5!705

Send 'on' value when checked.
Do not add checkbox in the request body if unchecked.

for example: SSLError: ('The read operation timed out',)

/reviewed-on nexedi/erp5!703

erp5.util.testbrowser: Require zope.testbrowser >= 5.0.0 since 5a0b3763 so update dependency accordingly.