Add ipt-server role with firewall configuration and management

- Created handlers for reloading systemd and restarting firewall services.
- Implemented tasks to ensure the existence of configuration directories and files.
- Deployed host-specific and shared configuration files using templates.
- Added scripts for managing IPv4 and IPv6 firewalls.
- Configured systemd service units for ipt-firewall and ip6t-firewall.
- Enabled and started firewall services on system boot.

roles/ipt-server/files/etc/ipt-firewall/ban_ipv6.list.sample

@@ -0,0 +1,20 @@
+# - IPv6 addresses listet here will be completly banned by the firewall
+# -
+# -    - Line beginning with '#' will be ignored.
+# -    - Blank lines will be ignored
+# -    - Only the first entry (until space sign or end of line) of each line will be considered.
+# -
+# - Valid values are:
+# -    complete IPv6 adresses like 240e:1ec0:4ab1:feba:e8b4:4fb1:7984:4c
+# -    network/nn CIDR notation like 240e:1ec0:4ab1:feba:e8b4:4fb1:7984:4c/56
+# -
+# -
+# - Note: 
+# -    - If no mask is given mask will be set to '64'
+# -    - wrong addresses like '2g01::1' or '2a01::1/129' will be ignored
+# -
+# - Example:
+# -    240e:ec:4ab1:feba:e8b4:4fb1:7984:4c
+# -    2a01:30:0:13:5054:ff::1
+# -    2a01:30:0:13:5054:ff::1/56
+