Check that auth value is not None (#151)

* Check that auth value is not None

The previous check for truth prevented the verify_ssl param from being
set to false, thus forcing ssl verfication in every case.

* Add changelog fragment

* Fix linting

changelogs/fragments/151-check-auth-params-for-existence.yaml

@@ -0,0 +1,3 @@
+---
+bugfixes:
+  - check auth params for existence, not whether they are true (https://github.com/ansible-collections/kubernetes.core/pull/151).

plugins/module_utils/common.py

@@ -124,7 +124,7 @@ def _raise_or_fail(exc, msg):
 
     # If authorization variables aren't defined, look for them in environment variables
     for true_name, arg_name in AUTH_ARG_MAP.items():
-        if module and module.params.get(arg_name):
+        if module and module.params.get(arg_name) is not None:
             auth[true_name] = module.params.get(arg_name)
         elif arg_name in kwargs and kwargs.get(arg_name) is not None:
             auth[true_name] = kwargs.get(arg_name)