Problem was that auto_repair, is_crashed and check_and_repair was not
implemented in ha_partition.

Solution, implemented them as loop over all partitions for is_crashed and
check_and_repair, and using the first partition for auto_repair.

(Recommit after fixing review comments)

mysql-test/lib/mtr_report.pl:
  Bug#35161: --myisam-recover does not work for partitioned MyISAM tables
  
  Added filter for crashed tables, when testing auto repair
mysql-test/std_data/corrupt_t1#P#p1.MYI:
  Bug#35161: --myisam-recover does not work for partitioned MyISAM tables
  
  Corrupt MYI file for testing auto repair
mysql-test/std_data/corrupt_t1.MYI:
  Bug#35161: --myisam-recover does not work for partitioned MyISAM tables
  
  Corrupt MYI file for testing auto repair
mysql-test/suite/parts/r/partition_repair_myisam.result:
  Bug#35161: --myisam-recover does not work for partitioned MyISAM tables
  
  Result file for testing auto repair of crashed myisam partitions
mysql-test/suite/parts/t/partition_repair_myisam-master.opt:
  Bug#35161: --myisam-recover does not work for partitioned MyISAM tables
  
  opt file for testing auto repair of crashed myisam partitions
mysql-test/suite/parts/t/partition_repair_myisam.test:
  Bug#35161: --myisam-recover does not work for partitioned MyISAM tables
  
  Test file for testing auto repair of crashed myisam partitions
sql/ha_partition.cc:
  Bug#35161: --myisam-recover does not work for partitioned MyISAM tables
  
  Added auto_repair as returning the first partitions auto_repair
  Added is_crashed and check_and_repair as loop over all partitions
sql/ha_partition.h:
  Bug#35161: --myisam-recover does not work for partitioned MyISAM tables
  
  Activating check_and_repair, auto_repair and is_crashed