add support for running kubernetes orchestrator from behind proxy

rl_coach/orchestrators/kubernetes_orchestrator.py

@@ -1,4 +1,4 @@
-
+import os
 import uuid
 from rl_coach.orchestrators.deploy import Deploy, DeployParameters
 from kubernetes import client, config
@@ -41,6 +41,9 @@ class Kubernetes(Deploy):
             self.deploy_parameters.namespace = current_context['context']['namespace']
         self.nfs_pvc_name = 'nfs-checkpoint-pvc'
 
+        if os.environ.get('http_proxy'):
+            client.Configuration._default.proxy = os.environ.get('http_proxy')
+
     def setup(self) -> bool:
 
         if not self.deploy_parameters.redis_ip: