Respect the KUBECONFIG environment variable if set

Author: yuvipanda

Diff for: config/kube_config.py

@@ -25,7 +25,7 @@
 
 from .config_exception import ConfigException
 
-KUBE_CONFIG_DEFAULT_LOCATION = '~/.kube/config'
+KUBE_CONFIG_DEFAULT_LOCATION = os.environ.get('KUBECONFIG', '~/.kube/config')
 _temp_files = {}