Attempting to kill query owned by different user now returns better error:
"You are not owner of query N" instead of "You are not owner of thread N".

Analysis: In fil_crypt_space_needs_rotation we first make sure that
tablespace is found and then separately that it is normal tablespace.
Thus, tablespace could be dropped between these two functions calls.

Fix: If space is not found from fil_system return tablespace type
ULINT_UNDEFINED and naturally do not continue rotating space.

Analysis: There is race between drop table and encryption threads that
could cause encryption thread to enter mutex that has been already
released.

Fix: When destroying crypt_data first enter the mutex and set crypt data
unavailable, then release the memory and clean up the data. This should
make the race more unprobable. Additionally, added big_test for
create_or_replace as it could fail testcase timeout
if you have slow I/O (tested that testcase passes with --mem).

as a workaround until the bug is fixed
don't run mroonga tests in --embedded mode by default

WARN_DEPRECATED_NO_REPLACEMENT(NULL, ...) was causing a warning,
because it expanded into NULL->variables.errmsgs[...]

because the actual merge was already done in
dced5146
as a patch

In non-wsrep builds, wsrep_running_threads should be defined to (0).

The version in sysvars_innodb,32bit,xtradb.rdiff was not updated

--gtid-ignore-duplicates was comparing sequence numbers as 32-bit, so
after 2**32 transactions things would start to fail.

The test did not wait until the server shuts down

Problem was that for queries of type:

select rand() r, rand()  p, rand() = rand() from a having r = p

The optimizer thought that r = p was same as rand() = rand() and this would always be true.

The problem was that when testing if two expressions are equal, we didn't take into account no determinstic functions.

The fix is to not compare non deterministic functions as equal.

Other things:
- Avoid calling init_and_set_log_file_name() when opening binary log.
- Remove newlines early when reading from index file.
- Ensure that reset_logs() will work even if thd is 0 (Can happen on startup)
- Added thd to sart_slave_threads() for better error handling.

Enable replication of GRANT/REVOKE ROLE commands across
galera nodes.

Cleanups, fixed warnings from valgrind, fixed failing tests (because on changes in WSREP initialization)

This should not have caused any notable errors in most cases.

After fix, we are not using keys to solve MIN/MAX if the string used for comparision is longer thant the column-

Conflicts:
	sql/item_subselect.cc

Fixed also typo in comment

- Cache variables.lc_messages->errmsgs->errmsgs in variables.errmsgs

This gives us 15 byte less code space and 2 memory references for any access to language dependent message,
of which there are 500 in the server..

In some cases NO_ZERO_DATE did not allow datetime values with zero date part
and non-zero time part (e.g. '0000-00-00 10:20:30.123456').
Allowing values of this kind in all known pieces of the code.

Additional changes :
* On startup, do not initialize wsrep if wsrep_on=0.
* On shutdown, stop wsrep replication only if > 0 wsrep
threads are running.

- Renaming variables so that they don't shadow others (After this patch one can compile with -Wshadow and get much fewer warnings)
- Changed ER(ER_...) to ER_THD(thd, ER_...) when thd was known or if there was many calls to current_thd in the same function.
- Changed ER(ER_..) to ER_THD_OR_DEFAULT(current_thd, ER...) in some places where current_thd is not necessary defined.
- Removing calls to current_thd when we have access to thd

Part of this is optimization (not calling current_thd when not needed),
but part is bug fixing for error condition when current_thd is not defined
(For example on startup and end of mysqld)

Notable renames done as otherwise a lot of functions would have to be changed:
- In JOIN structure renamed:
   examined_rows -> join_examined_rows
   record_count -> join_record_count
- In Field, renamed new_field() to make_new_field()

Other things:
- Added DBUG_ASSERT(thd == tmp_thd) in Item_singlerow_subselect() just to be safe.
- Removed old 'tab' prefix in JOIN_TAB::save_explain_data() and use members directly
- Added 'thd' as argument to a few functions to avoid calling current_thd.

Fixing non-BMP characters to have the same weight, as it was before
MDEV-8418 and MDEV-8417.

MDEV-8418 utf16: compare broken bytes as "greater than any non-broken character"