Re-enable the test mariabackup.unsupported_redo

Remove the logic for skipping the test if a log checkpoint occurred,
and the logic for tolerating failures. Thanks to MDEV-16791,
MLOG_INDEX_LOAD is supposed to always work.

mysql-test/suite/mariabackup/disabled.def

-unsupported_redo    : MDEV-16791 allows optimized redo
\ No newline at end of file

mysql-test/suite/mariabackup/unsupported_redo.result

@@ -7,7 +7,7 @@ call mtr.add_suppression("InnoDB: Cannot open datafile for read-only: ");
 call mtr.add_suppression("Table .* in the InnoDB data dictionary has tablespace id .*, but tablespace with that id or name does not exist");
 CREATE TABLE t1(i INT PRIMARY KEY auto_increment, a int) ENGINE INNODB;
 ALTER TABLE t1 FORCE, ALGORITHM=INPLACE;
-# Fails during full backup
+# No longer fails during full backup
 DROP TABLE t1;
 CREATE TABLE t1(i INT PRIMARY KEY auto_increment, a int) ENGINE INNODB;
 INSERT INTO t1(a) select 1 union select 2 union select 3;

mysql-test/suite/mariabackup/unsupported_redo.test

@@ -11,33 +11,15 @@ let $basedir=$MYSQLTEST_VARDIR/tmp/backup;
 let $incremental_dir=$MYSQLTEST_VARDIR/tmp/backup_inc1;
 
 CREATE TABLE t1(i INT PRIMARY KEY auto_increment, a int) ENGINE INNODB;
---source ../../suite/innodb/include/no_checkpoint_start.inc
 ALTER TABLE t1 FORCE, ALGORITHM=INPLACE;
 
-# Below mariabackup operation may complete successfully if checkpoint happens
-# after the alter table command.
-
-echo # Fails during full backup;
+echo # No longer fails during full backup;
 --disable_result_log
---error 0,1
 exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf  --backup --target-dir=$basedir;
 --enable_result_log
 
 DROP TABLE t1;
 
---let MYSQLD_DATADIR=$basedir/
-perl;
-open(OUT, ">$ENV{MYSQLTEST_VARDIR}/log/check.txt") || die;
-print OUT '
---let no_checkpoint_end=1
---let CLEANUP_IF_CHECKPOINT=rmdir $basedir;
---source ../../suite/innodb/include/no_checkpoint_end.inc
---exit Backup failed to fail despite MLOG_INDEX_LOAD record
-' if (-f "$ENV{MYSQLD_DATADIR}/xtrabackup_info");
-close(OUT);
-EOF
---source $MYSQLTEST_VARDIR/log/check.txt
---remove_file $MYSQLTEST_VARDIR/log/check.txt
 rmdir $basedir;
 
 CREATE TABLE t1(i INT PRIMARY KEY auto_increment, a int) ENGINE INNODB;
@@ -50,29 +32,14 @@ INSERT INTO t1(a) select 1 union select 2 union select 3;
 exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf  --backup --target-dir=$basedir;
 --enable_result_log
 
---source ../../suite/innodb/include/no_checkpoint_start.inc
 ALTER TABLE t1 FORCE, ALGORITHM=INPLACE;
 
 --disable_result_log
---error 0,1
 exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf  --backup --target-dir=$incremental_dir --incremental-basedir=$basedir;
 --enable_result_log
 
 DROP TABLE t1;
 
---let MYSQLD_DATADIR=$incremental_dir/
-perl;
-open(OUT, ">$ENV{MYSQLTEST_VARDIR}/log/check.txt") || die;
-print OUT '
---let no_checkpoint_end=1
---let CLEANUP_IF_CHECKPOINT=rmdir $basedir;rmdir $incremental_dir;
---source ../../suite/innodb/include/no_checkpoint_end.inc
---exit Backup failed to fail despite MLOG_INDEX_LOAD record
-' if (-f "$ENV{MYSQLD_DATADIR}/xtrabackup_info");
-close(OUT);
-EOF
---source $MYSQLTEST_VARDIR/log/check.txt
---remove_file $MYSQLTEST_VARDIR/log/check.txt
 rmdir $basedir;rmdir $incremental_dir;
 
 CREATE TABLE t1(i INT) ENGINE INNODB;