Get kubeconfig config file from os env if not passed to get_client (#321)

* Get kubeconfig config file from os env if not passed to get_client

* remove print

* remove newline

Author: rnetser

ocp_utilities/infra.py

@@ -56,6 +56,11 @@ def get_client(config_file=None, config_dict=None, context=None, **kwargs):
     try:
         # Ref: https://github.com/kubernetes-client/python/blob/v26.1.0/kubernetes/base/config/__init__.py
         LOGGER.info("Trying to get client via new_client_from_config")
+
+        # kubernetes.config.kube_config.load_kube_config sets KUBE_CONFIG_DEFAULT_LOCATION during module import.
+        # If `KUBECONFIG` environment variable is set via code, the `KUBE_CONFIG_DEFAULT_LOCATION` will be None since
+        # is populated during import which comes before setting the variable in code.
+        config_file = config_file or os.environ.get("KUBECONFIG", "~/.kube/config")
         return kubernetes.dynamic.DynamicClient(
             client=kubernetes.config.new_client_from_config(config_file=config_file, context=context, **kwargs)
         )