Set privkey_path in update_fileserver orch

saltbox/orchestrator/templates/orch_update_fileserver.j2

@@ -1,3 +1,4 @@
+{{ "{% set privkey_path = '%s' %}" | format(salt.pillar.get("saltbox:master:pillar:git_pillar_privkey")) }}
 {% raw %}
 ---
 {% set telegram = salt.pillar.get("telegram") %}
@@ -36,7 +37,7 @@ reset pillar checkout:
     - tgt_type: "grain"
     - kwarg:
         cwd: /srv/salt/pillars
-        identity: "{{ salt.pillar.get("saltbox:master:pillar:git_pillar_privkey") }}"
+        identity: "{{ privkey_path }}"
         opts: "--hard origin/master"
 
 update pillar checkout:
@@ -46,7 +47,7 @@ update pillar checkout:
     - tgt_type: "grain"
     - kwarg:
         cwd: /srv/salt/pillars
-        identity: "{{ salt.pillar.get("saltbox:master:pillar:git_pillar_privkey") }}"
+        identity: "{{ privkey_path }}"
 
 clear git locks:
   salt.runner: