prometheus endpoint missing

[Zempashi]

=================================== FAILURES ===================================
________________ test_check_node_exporter_prometheus_endpoints _________________
request = <FixtureRequest for <Function 'test_check_node_exporter_prometheus_endpoints'>>
    prometheus_endpoints_res.json(),
>   prometheus_endpoints))
tests/post/test_prometheus.py:41: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
.tox/tests/lib/python3.6/site-packages/pytest_bdd/scenario.py:195: in _execute_scenario
    _execute_step_function(request, scenario, step, step_func)
.tox/tests/lib/python3.6/site-packages/pytest_bdd/scenario.py:137: in _execute_step_function
    step_func(**kwargs)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
request = <FixtureRequest for <Function 'test_check_node_exporter_prometheus_endpoints'>>
group_name = 'all'
inventory_obj = <utils.helper.Inventory object at 0x7f6437780080>
    @then(parsers.parse('I should count as many endpoints as {group_name} hosts'))
    def count_prometheus_endpoint(request, group_name, inventory_obj):
        num_endpoints = len(request.prometheus_endpoints)
        num_nodes = len(inventory_obj.get_groups_dict()[group_name])

>       assert num_endpoints == num_nodes
E       assert 5 == 6

[Zempashi]

Seems related to #446