find_set() in typelib.c expected a zero-terminated string

include/typelib.h:
  disable unused flags

client/CMakeLists.txt:
  1. -rdynamic is a linker flag.
  2. it should be used in all builds, not debug only
libmysql/get_password.c:
  prefer a standard function, when possible
  (otherwise a plugin will need to load it from the client)

sql/share/errmsg-utf8.txt:
  correct the error message, as query_cache_type variable is not read-ony anymore
sql/sql_cache.cc:
  the caller should verify that query cache resize
  is possible, before trying it
sql/sys_vars.cc:
  * test if qc resize is possible in the sysvar on_check() funntion,
    not in the on_update() function.
  * use the error message that better describes the problem

disable test cases for bugs not fixed in xtradb.

mysql-test/suite/innodb/t/innodb-lock.test:
  instead of disabling the test in disabled.def
  (hoping that somebody someday will enable it),
  skip it only for xtradb (not for innodb), and
  only for the current xtradb version. the test
  will enable itself automatically on the next
  xtradb merge
mysql-test/suite/innodb/t/innodb_cmp_drop_table.test:
  instead of disabling the test in disabled.def
  (hoping that somebody someday will enable it),
  skip it only for xtradb (not for innodb), and
  only for the current xtradb version. the test
  will enable itself automatically on the next
  xtradb merge
mysql-test/suite/innodb/t/innodb_corrupt_bit.test:
  fix the error number
storage/innobase/handler/ha_innodb.cc:
  fix the error number
storage/xtradb/handler/ha_innodb.cc:
  fix the error number

mysql-test/mysql-test-run.pl:
  strace-client does not take an argument

when looking for tables to delete from

e.g 
cmake . -DWITH_XXXX_STORAGE_ENGINE=1

fix misleading test name

Fix for LP BUG#908269 Wrong result with subquery in select list, EXISTS, constant MyISAM/Aria table.

Problem: When building the condition for JOIN::outer_ref_cond the optimizer forgot to take into account
that this condition could depend on constant tables as well.

Packagers may attempt to outsmart MariaDB/MySQL build system -DBUILD_SHARED_LIBS=1, we need to minimize the damage of such attempts.

mysql-test/r/information_schema_all_engines.result:
  Update result
mysql-test/t/information_schema_all_engines.test:
  Added --sorted-results as tables in information_schema are not sorted.

Split IO threads into ones that handle only read completion and ones that handle only write completion, as it was originally done, but got lost with "completion port" patch. The reason we need to have dedicated read and dedicated write threads is that read completion routine can block waiting for write io to complete, and in rare cases where all io threads are handling async reads, it can deadlock.

- Create/use do_copy_nullable_row_to_notnull() function for ref access, which is used 
  when copying from not-NULL field in table that can be NULL-complemented to not-NULL field.

geometry fields are blobs too.

- ensure that mtr supressions table is flushed before doing controlled crash and restart
- use DBUG_SUICIDE() rather than abort() in partition tests - avoids a crash message/warning
- disable  perfschema all_instances test on Windows- there are  legitimate reasons  for output to be different on  Unix (some different threads, some different locks), the differences are expected to grow in the future, e.g with threadpool.

The patch for bug 685411 erroneously removed a call of engine->set_thd()
from Item_subselect::fix_fields().

If init_command was incorrect, we couldn't let users execute
queries, but we couldn't report the issue to the client either
as it does not expect error messages before even sending a
command. Thus, we simply disconnected them without throwing
a clear error.

We now go through the proper sequence once (without executing
any user statements) so we can report back what the problem
is. Only then do we disconnect the user.

As always, root remains unaffected by this as init_command is
(still) not executed for them.

mysql-test/r/init_connect.result:
  We now report a proper error if init_command fails.
  Expect as much.
mysql-test/t/init_connect.test:
  We now report a proper error if init_command fails.
  Expect as much.
sql/sql_connect.cc:
  If init_command fails, throw an error explaining this to
  the user.