Kopano spamd, Bugfixes (#17)

* Add container for kopano-spamd
* Authenticate version requests if needed
* Fix building of z-push for 'supported' base image
* Install kopano-spamd package by default
* Smaller fixes for kopano-spamd
* Fix missing file header
* simplify netrc usage

core/defaultconfigs/spamd.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python3
+import os
+import kcconf
+
+# Component specific configurations
+kcconf.configkopano({
+    r"/tmp/kopano/spamd.cfg":
+    {
+        # Certain configuration can be pre-defined at startup:
+        #'log_level': "3"
+    }
+})
+
+# Override configs from environment variables
+kcconf.configkopano(kcconf.parseenvironmentvariables(r"/tmp/kopano/"))