Clean-ups after applying InnoDB snapshot 5.1-ss6129:

- disabled main.innodb_bug47777.test with InnoDB plugin
  until fix for plugin is applied.
- disabled main.innodb-autoinc.test (failing)
- re-enabled main.innodb_bug39438.test
- added error message suppression to innodb_bug39438, as
  requested by InnoDB/Oracle
- reverted change to main.innodb_bug34300 as plugin specific.

mysql-test/t/innodb_bug34300.test

@@ -9,7 +9,6 @@
 -- disable_result_log
 
 # set packet size and reconnect 
-let $max_packet=`select @@global.max_allowed_packet`;
 SET @@global.max_allowed_packet=16777216;
 --connect (newconn, localhost, root,,)