add varchar type restoring test from 5.0 backup into 5.1


mysql-test/r/ndb_restore_compat.result:
  add test result for varchar type from 5.0 version backup into 5.1
mysql-test/t/ndb_restore_compat.test:
  add test for varchar type restoring from 5.0 backup into 5.1
mysql-test/std_data/ndb_backup50/BACKUP-2-0.1.Data:
  backup data
mysql-test/std_data/ndb_backup50/BACKUP-2-0.2.Data:
  backup data
mysql-test/std_data/ndb_backup50/BACKUP-2.1.ctl:
  meta data of 5.0 backup
mysql-test/std_data/ndb_backup50/BACKUP-2.1.log:
  log data of 5.0 backup
mysql-test/std_data/ndb_backup50/BACKUP-2.2.ctl:
  meta data of 5.0 backup
mysql-test/std_data/ndb_backup50/BACKUP-2.2.log:
  log data of 5.0 backup