* Fix var precedence check to support python 3.
* Run CI sanity tests using python 3.5.
* Disable pylint non-iterator-returned test to pass on python 3.5.
This commit also adds a new test script (ansible-var-precedence-check.py in code-smell/)
to provide us with another line of defense against precedence bugs going forward.
The precedence docs state that the INI vars have a lower precedence than group/host
vars files for inventory and playbooks, however that has not been the case since 2.0
was released. This change fixes that in one way, though not exactly as the docs say.
The rules are:
1) INI/script < inventory dir < playbook dir
2) "all" group vars < other group_vars < host_vars
So the new order will be (from the test script mentioned above):
8. pb_host_vars_file - var in playbook/host_vars/host
9. ini_host_vars_file - var in inventory/host_vars/host
10. ini_host - host var inside the ini
11. pb_group_vars_file_child - var in playbook/group_vars/child
12. ini_group_vars_file_child - var in inventory/group_vars/child
13. pb_group_vars_file_parent - var in playbook/group_vars/parent
14. ini_group_vars_file_parent - var in inventory/group_vars/parent
15. pb_group_vars_file_all - var in playbook/group_vars/all
16. ini_group_vars_file_all - var in inventory/group_vars/all
17. ini_child - child group var inside the ini
18. ini_parent - parent group var inside the ini
19. ini_all - all group var inside the ini
Fixes#21845
