munin: add timezone to timestamp on html pages

That's what I was looking for. Until our distribution of choice includes this fix, we can use:

--- /usr/share/munin/munin-html.orig    2010-01-26 19:22:09.000000000 +0100
+++ /usr/share/munin/munin-html 2010-01-26 19:26:59.000000000 +0100
@@ -311,7 +311,7 @@ foreach my $file( (@files) ) {
 
 #make domain list
 my @domainlist = map { { DOMAIN => $_ } } @domainorder;
-my $timestamp = strftime("%Y-%m-%d T %T", localtime);
+my $timestamp = strftime("%Y-%m-%d T %T %z", localtime);
 for my $domain (@domainorder) {
     logger("processing domain: $domain");
     my %domain;