calling update doesn't update the json files

Because we are using the `--tags deploy`
using --tags service_variant_config will run
the tasks in that file

playbooks/edx-east/connect_sandbox.yml

@@ -104,7 +104,8 @@
         - "EDXAPP_MYSQL_PASSWORD: {{ EDXAPP_MYSQL_PASSWORD }}"
       tags: update_edxapp_mysql_host
 
-    - name: call update on edx-platform
+    - name: call ansible-playbook locally to update mysql config
       shell: >
-        /edx/bin/update edx-platform master
+        /edx/bin/ansible-playbook -i localhost, -c local  -e@/edx/app/edx_ansible/server-vars.yml edxapp.yml  --tags service_variant_config
+        chdir=/edx/app/edx_ansible/edx_ansible/playbooks/edx-east
       tags: update_edxapp_mysql_host