Fix race condition in rpl_stop_start_slave. after kill connection, wait until it is gone in processlist

- Mark test components, plugins etc with COMPONENT Test, to get them excluded from the MSI
- Only include debug symbols for client and embedded libs and also
  mysqld.exe and server plugins (so we can still can get a callstack in case of crash)

The rest (all *.pdbs, test components, MTR) can be obtained from the big ZIP distribution, if required.

- do not attempt loading federatedx dynamically - does not work on Windows embedded
- race condition in rpl_start_stop_slave
- fix exclusion rule to catch warning in partition test

The file uses external variables defined in another (C++) source file. Since MSVC mangles variables and not only functions, either variables in question should be extern "C", or  sql_logger should be made C++ for link to succeed.

Fixed by renaming sql_logger.c to sql_logger.cc

        mysys/my_logger.c was moved to sql/sql_logger.c
        Logger service was rewritten with file functions instead of stream, so it
        can handle huge files.

              Added the logger service that provides us with the rotating logs.
              The plugin SQL_ERROR_LOG added. It logs the errors using the 'logger service'
                      for the rotating log files.
              the example record from the log:
                2012-03-09 15:07:29 root[root] @ localhost [] ERROR 1146: Table 'test.xyz' doesn't exist : select * from test.xyz

don't link with libbfd, exec addr2line, if it's available at run time

and collateral changes

https://mariadb.atlassian.net/browse/MDEV-28
  
This task implements a new clause LIMIT ROWS EXAMINED <num>
as an extention to the ANSI LIMIT clause. This extension
allows to limit the number of rows and/or keys a query
would access (read and/or write) during query execution.

make the test to require sphinx 2.0.4 or later

Fixed memory leaks and compiler warnings in ha_sphinx.cc
Added HA_MUST_USE_TABLE_CONDITION_PUSHDOWN so that an engine can force index condition to be used

mysql-test/suite/sphinx/sphinx.result:
  Added testing of pushdown conditions and sphinx status variables.
mysql-test/suite/sphinx/sphinx.test:
  Added testing of pushdown conditions and sphinx status variables.
mysql-test/suite/sphinx/suite.pm:
  Print version number if sphinx version is too old.
sql/handler.h:
  Added HA_MUST_USE_TABLE_CONDITION_PUSHDOWN so that an engine can force index condition to be used
sql/sql_base.cc:
  Added 'thd' argument to check_unused() to be able to set 'entry->in_use' if we call handler->extra().
  This was needed as sphinx (and possible other storage engines) assumes that 'in_use' is set if handler functions are called.
sql/sql_select.cc:
  Test if handler is forcing pushdown condition to be used.
storage/sphinx/ha_sphinx.cc:
  Updated to version 2.0.4
  Fixed memory leaks and compiler warnings.
storage/sphinx/ha_sphinx.h:
  Updated to version 2.0.4
storage/sphinx/snippets_udf.cc:
  Updated to version 2.0.4

The function create_hj_key_for_table() that builds the descriptor of
the hash join key to access a table of a materialized subquery must
ignore any equi-join predicate depending on the tables not belonging
to the subquery.

This is needed as last log entry may be a DDL that is not processed and then a table may be left in 'not properly closed state' even if information is correct in it.

mysql-test/README.suites:
  removed. it was turned into a manual, eventually
mysql-test/include/default_mysqld.cnf:
  use normal environment variables instead of magic @OPT.vardir
mysql-test/lib/My/ConfigFactory.pm:
  use normal environment variables instead of magic @OPT.vardir
mysql-test/mysql-test-run.pl:
  initialize environment variables before parsing the first my.cnf template - it may refer to them
mysql-test/suite/sphinx/my.cnf:
  use normal environment variables instead of magic @OPT.vardir

Problem is that subquery execution can't be called during prepare/optimize phase.

Also small fix for subquery test suite.

This bug in the function JOIN::drop_unused_derived_keys() could
leave the internal structures for a materialized derived table
in an inconsistent state. This led to a not quite correct EXPLAIN
output when no additional key had been created to access the table.
It also may lead to more serious consequences: so, the test case
added with this fix caused a crash in mariadb-5.5.20.  

mysql-test/include/rpl_udf.inc:
  supppression should be added after master-slave.inc to affect both a master and a slave
mysql-test/suite/rpl/t/rpl_udf.test:
  supppression should be added after master-slave.inc to affect both a master and a slave

mysql-test/include/have_xtradb.combinations:
  xtradb tests need this I_S table
mysql-test/lib/mtr_cases.pm:
  fix for .deb and .rpm installations

 - use thd->in_active_multi_stmt_transaction() for
   @@in_transaction, not THD flag directly
 - use common error_if_in_trans_or_substatement() function for
   all 4 binlog variables that cannot be changed inside
   statement or transaction.