No innodb_log_block_size support in xtrabackup_56

[Alexey Kopytov]

The 5.6-based binary (i.e. xtrabackup_56 which is used to backup both MySQL 5.6 and Percona Server 5.6 servers) does not support PS-specific innodb_log_block_size option in PS 5.6.11+ and fails when trying to backup a server with a non-default innodb_log_block_size value as follows:

InnoDB: Allocated tablespace 2, old maximum was 0
InnoDB: No valid checkpoint found.
InnoDB: If this error appears when you are creating an InnoDB database,
InnoDB: the problem may be that during an earlier attempt you managed
InnoDB: to create the InnoDB data files, but log file creation failed.
InnoDB: If that is the case, please refer to
InnoDB: http://dev.mysql.com/doc/refman/5.6/en/error-creating-innodb.html

[George Ormond Lorch III (gl-az)]

Hmmm, this seems like something that I should have caught with PTB...now wondering why, of maybe if I did but did not recognize the issue...