Fix wrongly return True when a comparison returns NotImplemented

[ubaumann]

My teammate @zwiy discovered the following issue:

Using the F filter on a not existing data key. All hosts will be returned by the filter.

    def test_eq__on_not_existing_key(self, nornir):
        f = F(not_existing__eq="test")
        filtered = sorted(list((nornir.inventory.filter(f).hosts.keys())))

>       assert filtered == []
E       AssertionError: assert ['dev1.group_1',\n 'dev2.group_1',\n 'dev3.group_2',\n 'dev4.group_2',\n 'dev5.no_group',\n 'dev6.group_3'] == []
E         Left contains 6 more items, first extra item: 'dev1.group_1'
E         Full diff:
E           [
E         -  ,
E         +  'dev1.group_1',
E         +  'dev2.group_1',
E         +  'dev3.group_2',
E         +  'dev4.group_2',
E         +  'dev5.no_group',
E         +  'dev6.group_3',
E           ]

The issue was the dict object, returning a NotIplemented comparing a "string" with a dict

>>> {}.__eq__({})
True
>>> {}.__eq__("string")
NotImplemented
>>> {}.__eq__(123)
NotImplemented
>>> type({}.__eq__(123))
<class 'NotImplementedType'>
>>>
>>> bool({}.__eq__(123))
True
>>>

[dbarrosop]

Thanks!