cks: fix k8s cluster network deletion

[shwstppr]

Description

Fixes #4133
Fixes #4056

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?

[yadvr]

@blueorangutan package

[blueorangutan]

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

[blueorangutan]

Packaging result: ✔centos7 ✔debian. JID-1340

[shwstppr]

@blueorangutan test

[blueorangutan]

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

[blueorangutan]

Trillian test result (tid-1713)
Environment: kvm-centos7 (x2), Advanced Networking with Mgmt server 7
Total time taken: 48085 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr4134-t1713-kvm-centos7.zip
Intermittent failure detected: /marvin/tests/smoke/test_kubernetes_clusters.py
Intermittent failure detected: /marvin/tests/smoke/test_vpc_redundant.py
Smoke tests completed. 82 look OK, 1 have error(s)
Only failed tests results shown below:

Test	Result	Time (s)	Test File
test_01_deploy_kubernetes_cluster	Error	1118.66	test_kubernetes_clusters.py
test_02_deploy_kubernetes_ha_cluster	Error	0.05	test_kubernetes_clusters.py
test_04_deploy_and_upgrade_kubernetes_cluster	Error	1208.13	test_kubernetes_clusters.py
test_05_deploy_and_upgrade_kubernetes_ha_cluster	Error	0.03	test_kubernetes_clusters.py
test_06_deploy_and_invalid_upgrade_kubernetes_cluster	Error	0.03	test_kubernetes_clusters.py
test_07_deploy_and_scale_kubernetes_cluster	Error	0.03	test_kubernetes_clusters.py
ContextSuite context=TestKubernetesCluster>:teardown	Error	45.15	test_kubernetes_clusters.py

[yadvr]

@shwstppr is this ready for review/testing?

[shwstppr]

@rhtyd will test and update. Tests failed. I've to check the reason. And maybe refactor tests alongwith this change to make them more reliable

[blueorangutan]

Packaging result: ✖centos7 ✖debian. JID-1394

[blueorangutan]

Packaging result: ✖centos7 ✖debian. JID-1395

[blueorangutan]

Packaging result: ✔centos7 ✔debian. JID-1396

[yadvr]

@shwstppr can you club your cks PRs, and at least change base branch to 4.14?

[shwstppr]

Moved #4116