Reorder options passed to adduser in scripts: make -S first.

main/vsftpd/vsftpd.pre-install

testing/consul/consul.pre-install

...win-streaming-server/darwin-streaming-server.post-install

testing/elasticsearch/elasticsearch.pre-install

testing/exim/exim.pre-install

testing/h2o/h2o.pre-install

testing/knot/knot.pre-install

testing/logstash/logstash.pre-install

testing/ntopng/ntopng.pre-install

testing/openxcap/openxcap.pre-install

testing/rmilter/rmilter.pre-install

testing/rspamd/rspamd.pre-install

testing/tor/tor.pre-install

unmaintained/apache-couchdb/apache-couchdb.post-install

unmaintained/shadowircd/shadowircd.pre-install