Implemented #4271 Creating vHost Website Alias copies default index.html thus breaking the original site if it's based on index.php (or something not index.html)

- Added missing shell escaping

If you add/remove server IPs the file `/etc/apache2/sites-available/ispconfig.conf` gets recreated and it is missing the alias for Let's Encrypt ACME challenges. Copying over the current install template fixes that. 

Maybe one could remove this template duplication completely by using `server/conf/apache_ispconfig.conf.master` in the install process?

The `Header set Content-Type "text/plain"` was only in `server/conf/apache_ispconfig.conf.master` and not in `install/tpl/apache_ispconfig.conf.master` – is it necessary?

The cipher suites are only set now for ISPConfig's own vhost, the intermediate security profile from Mozilla is used here.

How to reproduce issue

DNSSEC-Cronjob should only run on ispconfig master as we are working with datalog and not accessing things directly

https://www.howtoforge.com/community/threads/quota-warnings-notifications.73747/#post-347405

Update bind_plugin.inc.php to correct "PHP Parse error:  syntax error, unexpected ':' in /usr/local/ispconfig/server/plugins-available/bind_plugin.inc.php on line 279"

Do not move files to junk when autoresponder is on, just dont send an autoresponse when mail is marked as spam.