ass priority to syslog data model

Signed-off-by: John Crispin <john@phrozen.org>

renderer/templates/services/log.uc

@@ -6,3 +6,4 @@ set system.@system[-1].log_ip={{ s(log.host) }}
 set system.@system[-1].log_port={{ s(log.port) }}
 set system.@system[-1].log_proto={{ s(log.proto) }}
 set system.@system[-1].log_size={{ s(log.size) }}
+set system.@system[-1].log_priority={{ s(log.priority) }}

schema/service.log.yml

@@ -33,3 +33,10 @@ properties:
     type: integer
     minimum: 32
     default: 1000
+  priority:
+    description:
+      Filter messages by their log priority. the value maps directly to the 0-7
+      range used by syslog.
+    type: integer
+    minimum: 0
+    default: 7