Remove --playbook all option from overcloud update run

There is no need to explicitly pass '--playbook all' to openstack update
run command, because it is no longer relevant and 'all' is a default[1].
Also for minor update there is only one playbook generated from heat
stack output[2].

[1] https://github.com/openstack/python-tripleoclient/blob/master/tripleoclient/v1/overcloud_update.py#L178
[2] d027aa968a/tripleoclient/constants.py

Change-Id: I20da51e9794ce6cea5d976f17baa125e5a336975

templates/overcloud_update_run.sh.j2

@@ -34,6 +34,6 @@ openstack overcloud update run ${RUN_ANSWER} \
     {% if tripleo_upgrade_debug|bool %}
     --debug \
     {% endif %}
-    --limit {{ item }} --playbook all 2>&1
+    --limit {{ item }} 2>&1
 
 {% endif %}