bitbake: toastergui: tests Fix and more comprehensive typeahead unittest

Fix the currently broken unit test for typeaheads and add some
additional fields to check for in layers, projects, recipes and machines
typeaheads.

(Bitbake rev: 5700cd269e3a4fd517e16a3a19e61a23091df465)

Signed-off-by: Michael Wood <michael.g.wood@intel.com>
Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>