Merge lp:~percona-toolkit-dev/percona-toolkit/pt-table-sync-fails-to-close-one-db-handle-1401399 into lp:~percona-toolkit-dev/percona-toolkit/release-2.2.14

[Frank Cizmich]

Auxiliary db connections created at start of run sometimes timeout when their work is already done.
This change avoids confusing errors when closing connections at the very end of the tool run.

=== modified file 'bin/pt-table-sync'
--- bin/pt-table-sync	2015-01-23 10:19:56 +0000
+++ bin/pt-table-sync	2015-04-08 19:36:52 +0000
@@ -11039,6 +11039,12 @@
          my $dbh = $host->{$thing};
          next unless $dbh;
          delete $dsn_for{$dbh};
+         # The following is for when misc_dbh loses
+         # connection due to timeout. Since it has nothing 
+         # to commit we avoid reporting an error.
+         if ( $thing eq 'misc_dbh' &&  !$dbh->ping() ) {
+           next; 
+         }
          $dbh->commit() unless $dbh->{AutoCommit};
          $dbh->disconnect();
          PTDEBUG && _d('Disconnected dbh', $dbh);