[CE-441][CE-447] Fix SSL and remove redundant code

Currently, error will be thrown while user try to creat
kubernets type host with SSL enable and the get_config
function will try to list all pods in kubernetes cluster,
which is unnecessary since check_health function will do that,
this patch is meant to fix the SSL bug and delete redundant code.

CE-441 # done
CE-447 # done

Change-Id: I1ec1dccc59dace10f5c12cc64f6cec198eeff5ed
Signed-off-by: luke <jiahaochen1993@gmail.com>

src/agent/k8s/host_operations.py

@@ -63,21 +63,12 @@ def _get_config_from_params(self, k8s_params):
             k8s_config.verify_ssl = False
         else:
             k8s_config.verify_ssl = True
-            k8s_config.ssl_ca_cert = k8s_params.get('K8SSslCert')
+            k8s_config.ssl_ca_cert = \
+                config.kube_config. \
+                _create_temp_file_with_content(k8s_params.get('K8SSslCert'))
 
         client.Configuration.set_default(k8s_config)
 
-        v1 = client.CoreV1Api()
-        try:
-            v1.list_pod_for_all_namespaces(watch=False)
-        except Exception as e:
-            error_msg = (
-                "Cannot create kubernetes host due "
-                "to an incorrect parameters."
-            )
-            logger.error("Kubernetes host error msg: {}".format(e))
-            raise Exception(error_msg)
-
         return k8s_config
 
     def check_host(self, k8s_params):