don't use internal undocumented OpenSSL functionality

MDEV-13499: Backing up table that "doesn't exist in engine" cause crash in mariabackup when using encryption

Problem was that there is intentional crah when .ibd file does
not found. In mariabackup case we should avoid this crash.

When galera is used we want a stop to kill off not only the mysqld
process but the entire process group created by galera to perform
sst or wsrep_notify_cmd.`

Since 736afe86 the
mysql_system_tables_data.sql only installs the anonymous
user if skip_auth_anonymous IS NULL.

Its installation is prevented by setting this to 1.

on Appveyor

MDEV-15045 - wsrep_sst_mysqldump: enforce a minimum version only

MDEV-13789: FreeBSD wsrep_sst_xtrabackup-v2 - find compatibilty +lsof

check availability of rsync utility early , when starting backup with
--rsync. Fail if it is not there.

Based off #451 by angeloudy <angeloudy@yahoo.com> and
Tao Zhou <taozhou@ip-179.ish.com.au>

The warning was originally added in
commit c6766305
(MySQL 4.1.12, 5.0.3) to trace claimed undo log corruption that
was analyzed in https://lists.mysql.com/mysql/176250
on November 9, 2004.

Originally, the limit was 20,000 undo log headers or transactions,
but in commit 9d6d1902
in MySQL 5.5.11 it was increased to 2,000,000.

The message can be triggered when the progress of purge is prevented
by a long-running transaction (or just an idle transaction whose
read view was started a long time ago), by running many transactions
that UPDATE or DELETE some records, then starting another transaction
with a read view, and finally by executing more than 2,000,000
transactions that UPDATE or DELETE records in InnoDB tables. Finally,
when the oldest long-running transaction is completed, purge would
run up to the next-oldest transaction, and there would still be more
than 2,000,000 transactions to purge.

Because the message can be triggered when the database is obviously
not corrupted, it should be removed. Heavy users of InnoDB should be
monitoring the "History list length" in SHOW ENGINE INNODB STATUS;
there is no need to spam the error log.

Roll back to most general duplicate removing strategi in case of different stratagies for one position.

Backport the fix from 10.0.33 to 5.5, in case someone compiles XtraDB
with -DUNIV_LOG_ARCHIVE

The XtraDB option innodb_track_changed_pages causes
the function log_group_read_log_seg() to be invoked
even when recv_sys==NULL, leading to the SIGSEGV.

This regression was caused by
MDEV-11027 InnoDB log recovery is too noisy

innodb/buf_LRU_get_free_block
	Add debug instrumentation to produce error message about
	no free pages. Print error message only once and do not
	enable innodb monitor.

xtradb/buf_LRU_get_free_block
	Add debug instrumentation to produce error message about
	no free pages. Print error message only once and do not
	enable innodb monitor. Remove code that does not seem to
	be used.

innodb-lru-force-no-free-page.test
	New test case to force produce desired error message.

dict_foreign_find_index(): Ignore incompletely created indexes.
After a failed ADD UNIQUE INDEX, an incompletely created index
could be left behind until the next ALTER TABLE statement.

This bug affects both writing and reading encrypted redo log in
MariaDB 10.1, starting from version 10.1.3 which added support for
innodb_encrypt_log. That is, InnoDB crash recovery and Mariabackup
will sometimes fail when innodb_encrypt_log is used.

MariaDB 10.2 or Mariabackup 10.2 or later versions are not affected.

log_block_get_start_lsn(): Remove. This function would cause trouble if
a log segment that is being read is crossing a 32-bit boundary of the LSN,
because this function does not allow the most significant 32 bits of the
LSN to change.

log_blocks_crypt(), log_encrypt_before_write(), log_decrypt_after_read():
Add the parameter "lsn" for the start LSN of the block.

log_blocks_encrypt(): Remove (unused function).

2cd31691 broke conf_to_src,
because strings library is now dependend on mysys (my_alloc etc are used
now directly in string lib)

Fix by adding appropriate dependency.

Also exclude conf_to_src from VS IDE builds. EXCLUDE_FROM_ALL
is not enough for that.

debug_key_management
encrypt_and_grep
innodb_encryption

If real table count is different from what is expected by the test, it
just hangs on waiting to fulfill hardcoded number. And then exits with
**failed** after 10 minutes of wait: quite unfriendly and hard to
figure out what's going on.

trx_undo_rec_get_partial_row(): When the PRIMARY KEY includes a
column prefix of an externally stored column, the already parsed
part of the undo log record may contain a reference to
an off-page column. This is the case in the bug58912 test in
innodb.innodb.

This is a regression caused by MDEV-14051 'Undo log record is too big.'

Purge in the secondary index is wrongly skipped in
row_purge_upd_exist_or_extern() because node->row only does not contain all
indexed columns.

trx_undo_rec_get_partial_row(): Add the parameter for node->update
so that the updated columns will be copied from the initial part
of the undo log record.

cherry-pick e6ce97a5

* don't use Env module in tests, use $ENV{xxx} instead
* collateral changes:
** $file in the error message was unset
** $file in the other error message was unset too :)
** source file arguments are conventionally upper-cased
** abort the test (die) on error, don't just echo/exit