fix Conflicting ID for ...crt_cert_permissions

This error occures when multiple certs signed by same CA are requested
on minion.

Change-Id: I6b20ab4e1795298c94f55fdc61af99f933d8491c

salt/minion/cert.sls

@@ -84,7 +84,7 @@ salt_minion_cert_{{ cert_name }}_dirs:
       - cmd: salt_minion_cert_{{ cert_name }}_all
     {%- endif %}
 
-{{ ca_file }}_cert_permissions:
+{{ ca_file }}_cert_permissions_{{ rowloop.index }}:
   file.managed:
     - name: {{ ca_file }}
     - mode: 0644