Connect syndic minions to syndic master

Syndics are generally the masters assigned to their region.
We want the minions on syndics to connect to their upstream master
("master of masters") instead of to themselves.

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

salt/profile/salt/minion.sls

@@ -1,7 +1,14 @@
+{%- set netbox_pillar = salt['pillar.get']('netbox') -%}
+{%- if 'salt.syndic' in netbox_pillar['custom_fields']['salt_roles'] -%}
+{%- set master = salt['pillar.get']('salt:master:syndic_master') -%}
+{%- else -%}
+{%- set master = netbox_pillar['config_context']['salt_master'] -%}
+{%- endif -%}
+
 /etc/salt/minion.d/master.conf:
   file.managed:
     - contents:
-      - 'master: {{ salt['pillar.get']('netbox:config_context:salt_master') }}'
+      - 'master: {{ master }}'
     - require_in:
       - service: salt-minion
     - watch_in: