default teardown methods with reversed() handling

[DaanHoogland]

Description

In this a small change to improve the marvin framework for resource cleanup and adding examples in the test-implementations.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)

Screenshots (if appropriate):

How Has This Been Tested?

[DaanHoogland]

any thoughts @GabrielBrascher @borisstoyanov @rhtyd

[DaanHoogland]

also @vladimirpetrov

[GabrielBrascher]

LGTM based on code review.

[DaanHoogland]

@blueorangutan package

[blueorangutan]

@DaanHoogland a Jenkins job has been kicked to build packages. I'll keep you posted as I make progress.

[blueorangutan]

Packaging result: ✔centos7 ✔centos8 ✔debian. JID-2377

[DaanHoogland]

@blueorangutan test

[blueorangutan]

@DaanHoogland a Trillian-Jenkins test job (centos7 mgmt + kvm-centos7) has been kicked to run smoke tests

[DaanHoogland]

@borisstoyanov @vladimirpetrov can you review please?

[blueorangutan]

Trillian test result (tid-3162)
Environment: kvm-centos7 (x2), Advanced Networking with Mgmt server 7
Total time taken: 33390 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr4289-t3162-kvm-centos7.zip
Intermittent failure detected: /marvin/tests/smoke/test_privategw_acl.py
Smoke tests completed. 86 look OK, 0 have error(s)
Only failed tests results shown below:

Test	Result	Time (s)	Test File

[borisstoyanov]

LMGT, based on code and test results