Just clean original config

Original config file should not be deleted but only cleaned,
so that it is not recreated during package update.

Change-Id: I8ead90fd92c20dc7ebeadbb9134a6c21a52d3481
Closes-Bug: 1347533
Closes-Bug: rhbz#1122192
(cherry picked from commit f8511f2f79f5457940f1617f4e786cac2264b7e4)
Separate ALLOWED_HOSTS and ServerAlias configuration

In some cases it is required to be possible to have different values
of parameter ALLOWED_HOSTS in settings_local.py and ServerAlias directives
in vhost.conf. This patch separated parameter $fqdn to two new parameters:
$allowed_hosts and $server_aliases.

Change-Id: I431ec01dd32e5e7c460251502dbd1c1b03ec2fe7
(cherry picked from commit 16b482ea21a70d8dd06ab4c98ac5a218399b0213)