It broke the installer

This reverts commit 07a7ae1f.

Conflicts:
	install/lib/installer_base.lib.php

removed check against web service for install state of panel (when config file is there, installer installed it which assures that webserver is installed and configured - or someone messed around)

Changed behaviour of UFW installation. Do not enable it by deafult as the firewall will get enabled autmatically when a firewall record gets added in ispconfig. Enabling it without that record, the Firewall would lock out the user on next reboot.