Postfix: Split TLSPol companion app into separate container (#6688)

* postfix: split postfix-tlspol service into new container

* postfix-tls-pol: added debug mode

* pf-tlspol: removed obsoleted standalone conf from Dockerfiles

* pf-tlspol: use git instead of wget

data/Dockerfiles/postfix-tlspol/docker-entrypoint.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+if [[ ! -z ${REDIS_SLAVEOF_IP} ]]; then
+  cp /etc/syslog-ng/syslog-ng-redis_slave.conf /etc/syslog-ng/syslog-ng.conf
+fi
+
+exec "$@"