Add crd support

[siaomingjeng]

Add Custom Resource Definition (CRD)

Following the existing Custom Resource Object functions to add support for CRD read and list.

Fixes #108

Before merge following needs to be applied:

• At least one example testcase added in testcases/
• Library Documentation regenerated according to Generate docs
• PR entry added in CHANGELOG.md in In progress section
• All new testcases tagged as prerelease along other tags to exclude it from execution until released on PyPI
• Coverage threshold increased in .coveragerc if new coverage is higher than actual, see the lint-and-coverage step in CI

fail_under = 86

[m-wcislo]

Let's move discussion here. Seems the problem you faced in grafana helm issue: grafana/helm-charts#1515

[siaomingjeng]

Can anybody help with the test requirements?

Get below error when trying to add test in test/test_KubeLibrary.py. Looks like the test run engineer does not have permission to read CRD's.

Traceback (most recent call last):
File "/home/circleci/.local/lib/python3.8/site-packages/urllib3/connection.py", line 174, in _new_conn
conn = connection.create_connection(
File "/home/circleci/.local/lib/python3.8/site-packages/urllib3/util/connection.py", line 95, in create_connection
raise err
File "/home/circleci/.local/lib/python3.8/site-packages/urllib3/util/connection.py", line 85, in create_connection
sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused

[m-wcislo]

I think the problem is that in unit tests you are actually trying to connect to real cluster which doesn't exist, you are not using mock

@mock.patch('kubernetes.client.BatchV1beta1Api.<your functionality>')

which would allow your test to act as cluster is in place

[m-wcislo]

you are missing

[Tags]    other

as a result they are not executed in CI

[m-wcislo]

add mocks and perform actual check

[siaomingjeng]

Thanks for your reply! Really appreciate it. Will fix it later on.