add dispatch class for ibackup

manifests/rules/out/ibackup.pp

+# manage firewall for outgoing ssh
+class firewall::rules::out::ibackup(
+  Array[Stdlib::IP::Address::Nosubnet] $backup_hosts,
+){
+  include firewall
+  if $firewall::use_nftables {
+    $backup_hosts.each |$index,$ip| {
+      if $ip =~ Stdlib::IP::Address::V4::Nosubnet {
+        $dest = "ip daddr ${ip}"
+      } else {
+        $dest = "ip6 daddr ${ip}"
+      }
+      nftables::rule {
+        "default_out-ssh_ibackup-${index}":
+          content => "${dest} tcp dport 22 accept",
+      }
+    }
+  } else {
+    class{'shorewall::rules::out::ibackup':
+      backup_hosts => $backup_hosts,
+    }
+  }
+}