merge in some upgrade warnings from trunk

git-svn-id: svn+ssh://svn.bestpractical.com/svn/bps-public/rt/3.8/branches/3.8.3-releng@19772 e417ac7c-1bcc-0310-8ffa-8f5827389a85

etc/upgrade/upgrade-mysql-schema.pl

@@ -223,6 +223,13 @@
 convert_table($_) foreach @tables;
 
 print join "\n", map(/;$/? $_ : "$_;", @sql_commands), "";
+my $use_p = $db_pass ? " -p" : '';
+print STDERR <<ENDREMINDER;
+-- ** NOTICE: No database changes have been made. **
+-- Please review the generated SQL, ensure you have a full backup of your database 
+-- and apply it to your database using a command like:
+-- mysql -u ${db_user}${use_p} $db_name < queries.sql";
+ENDREMINDER
 exit 0;
 
 my %alter_aggregator;