fix bug #682: change at the Gui the used disk size.

in the pvesm and pvesh we are giving the correct size of the used space from a disk.
this change make the output of Gui and CLI consistent.

bin/pvestatd

@@ -273,10 +273,7 @@ sub update_storage_status {
 	my $d = $info->{$storeid};
 	next if !$d->{active};
 
-	# everything not free is considered to be used
-	my $realused = $d->{total} - $d->{avail};
-
-	my $data = "$ctime:$d->{total}:$realused";
+	my $data = "$ctime:$d->{total}:$d->{used}";
 
 	my $key = "pve2-storage/${nodename}/$storeid";
 	PVE::Cluster::broadcast_rrd($key, $data);

www/manager/storage/StatusView.js

@@ -49,12 +49,7 @@ Ext.define('PVE.storage.StatusView', {
 	    used: {
 		header: gettext('Used'), 
 		required: true, 
-		renderer: function(value) {
-		    // do not confuse users with filesystem details
-		    var total = me.getObjectValue('total', 0);
-		    var avail = me.getObjectValue('avail', 0);
-		    return PVE.Utils.render_size(total - avail);
-		}
+		renderer: PVE.Utils.render_size
 	    },
 	    avail: {
 		header: gettext('Avail'),