fix port sorting in generated firewall rules file #345

Job	Run time
lint-unit / markdown-link-check	20s
lint-unit / check-metadata	4s
lint-unit / cookstyle	39s
lint-unit / markdownlint-cli2	3s
lint-unit / rspec	33s
lint-unit / yamllint	9s
integration (amazonlinux-2, firewalld)	20s
integration (amazonlinux-2, iptables)	25s
integration (centos-7, firewalld)	22s
integration (centos-7, iptables)	22s
integration (centos-stream-8, iptables)	24s
integration (debian-9, ufw)	25s
integration (debian-10, ufw)	22s
integration (debian-11, firewalld-dbus)	22s
integration (debian-11, nftables)	29s
integration (ubuntu-1804, ufw)	23s
integration (ubuntu-2004, ufw)	21s
	6m 3s

Provide feedback