keepalived UI: add keepalived UI

BPFire red0 does not support multicast, need to
have unicast peer configured, then the virtual
ipaddress can be added to red0 interface.

the UI requires /var/ipfire/keepalived/runsettings
/var/ipfire/keepalived/settings to be created, so
add them lfs/configroot

Signed-off-by: Vincent Li <vincent.mc.li@gmail.com>

config/cfgroot/general-functions.pl

@@ -366,6 +366,14 @@ sub validip
 	}
 }
 
+sub validnum {
+	my $num = shift;
+	if ($num =~ /^\d+$/) {
+		return 1;
+	}
+	return 0;
+}
+
 sub validmask {
 	my $mask = shift;