[k8s] Use gunicorn sync mode in helm install for now

Author: romainr

tools/kubernetes/helm/hue/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 description: Hue is an SQL Cloud Editor for Data Warehouses and Databases.
 name: hue
-version: 1.0.0
+version: 1.0.1
 appVersion: 1.0
 keywords:
 - Hue

tools/kubernetes/helm/hue/values.yaml

@@ -25,7 +25,7 @@ hue:
     secret_key=hue123
     app_blacklist=filebrowser,search,hbase,security,jobbrowser,oozie
     django_debug_mode=false
-    gunicorn_work_class=gevent
+    gunicorn_work_class=sync
     enable_prometheus=true
 
     [[task_server]]