toaster: toastergui tests Add generic test for ToasterTables widget

toaster: toastergui tests Add generic test for ToasterTables widget

For each of the ToasterTables defined test:
 - Data returned
 - Search
 - Order by
 - Limit
 - Paginate
 - Filter

These tests test that the functions on all tables work, it does not
validate the content of the data in the tables themselves, this needs
to be done in table specific tests.

Signed-off-by: Michael Wood <michael.g.wood@intel.com>
Signed-off-by: Elliot Smith <elliot.smith@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>