We removed support for built-in InnoDB (i.e. the "5.1" target) in 2.1. Which means any references to "5.1" and "xtrabackup_51" are just remnants and should be removed as well, rather than changed to innodb51/xtrabackup_plugin.
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We removed support for built-in InnoDB (i.e. the "5.1" target) in 2.1. Which means any references to "5.1" and "xtrabackup_51" are just remnants and should be removed as well, rather than changed to innodb51/ xtrabackup_ plugin.