relayd: permit commas between hosts in tables

relayd.conf(5) mentions the following:

  Each table must contain at least one host address; multiple hosts are
  separated by newline, comma, or whitespace.

So the addition of commas as separators should now cover all possible
cases.

Without this, hosts separated by commas in a table will show up with a
trailing comma in their host name and will probably not get their stats
correctly assigned when grabbing information from relayctl.

plugins/relayd/relayd

@@ -74,7 +74,7 @@ while ( $content =~ /^\s*table\s*<([^>]+)>\s*{([^}]+)}/mg) {
         $hosts =~ s/#.*$//mg; # comments
         $hosts =~ s/^\s+//mg; # trim spaces before lines
         print "hosts: $hosts\n" if $Munin::Plugin::DEBUG;
-        push @hosts , split /\s+/, $hosts;
+        push @hosts , split /,?\s+/, $hosts;
 }
 
 if ($cmd eq 'config') {