Add support for CRD list and read

[siaomingjeng]

Currently there is no support for custom resource definition.
We need at least add list and read, in order to test whether the required CRD exists for many test cases.

[siaomingjeng]

Anybody can help with below checks?

Error: INSTALLATION FAILED: unable to build kubernetes objects from release manifest: resource mapping not found for name: "grafana" namespace: "" from "": no matches for kind "PodSecurityPolicy" in version "extensions/v1beta1"
ensure CRDs are installed first

............Env var "SECRET_NAME" value "wrong" not matching actual "webhook-server-secret"
Env var "NOT_EXISTING" not found in actual
Failed parsing Container Env Var JSON:{"badlyformatted:}
.Annotation "checksum/config" value "wrong" not matching actual "1c42968a1b9eca0bafc3273ca39c4705fe71dc632e721db9e8ce44ab1b8e1428"
Annotation "notexists" not found in actual
Failed parsing Pod Annotations JSON:{"badlyformatted:}
.Label "app" value "wrong" not matching actual "octopus"
Label "notexists" not found in actual
Failed parsing Pod Labels JSON:{"badlyformatted:}
......s.................................
----------------------------------------------------------------------
Ran 54 tests in 0.410s

OK (skipped=1)
Name                             Stmts   Miss  Cover
----------------------------------------------------
src/KubeLibrary/KubeLibrary.py     441     66    85%
src/KubeLibrary/__init__.py          1      0   100%
src/KubeLibrary/exceptions.py        5      0   100%
src/KubeLibrary/version.py           1      0   100%
----------------------------------------------------
TOTAL                              448     66    85%
Coverage failure: total of 85 is less than fail-under=86

Exited with code exit status 2