In galera cluster, the definer (and thus binlog invoker) must be set
for CREATE ROLE before Query_log_event is created during TOI on the
originating node.

auth_pam: debug output

- mysql-test/unstable-tests list is created, it includes
  = tests identified as unstable by Debian;
  = tests which failed in buildbot on 10.0 over the last ~6 months and were not fixed;
  = tests which have been recently modified or newly added
- '*' wildcard is now supported in skip lists

Followup from 5.5 patch. Removing memory barriers on intel is wrong as
this doesn't prevent the compiler and/or processor from reorganizing reads
before the mutex release. Forcing a memory barrier before reading the waiters will
guarantee that no speculative reading takes place.

In well defined C code, the "this" pointer is never NULL. Currently, we
were potentially dereferencing a NULL pointer (master_info_index). GCC v6
removes any "if (!this)" conditions as it assumes this is always a
non-null pointer. In order to prevent undefined behaviour, check the
pointer before dereferencing and remove the check within member
functions.

- Remove impossible test in test_quick_select
- Ensure that is_fatal_error is set if we run out of stack space

The issue was that when running with valgrind the wait for master_pos_Wait()
was not long enough.

This patch also fixes two other failures that could affect rpl_mdev6020:
- check_if_conflicting_replication_locks() didn't properly check domains
- 'did_mark_start_commit' was after signals to other threads was sent which could
  get the variable read too early.

.. file '/var/log/mysql/mariadb-bin.000001' not found in binlog
index, needed for recovery. Aborting.

In Galera cluster, while preparing for rsync/xtrabackup based
SST, the donor node takes an FTWRL followed by (REFRESH_ENGINE_LOG
in rsync based state transfer and) REFRESH_BINARY_LOG. The latter
rotates the binary log and logs Binlog_checkpoint_log_event
corresponding to the penultimate binary log file into the new file.
The checkpoint event for the current file is later logged
synchronously by binlog_background_thread.

Now, since in rsync/xtrabackup based snapshot state transfer methods,
only the last binary log file is transferred to the joiner node; the
file could get transferred even before the checkpoint event for the
same file gets written to it. As a result, the joiner node would fail
to start complaining about the missing binlog file needed for recovery.

In order to fix this, a mechanism has been put in place to make
REFRESH_BINARY_LOG operation wait for Binlog_checkpoint_log_event
to be logged for the current binary log file if the node is part of
a Galera cluster. As further safety, during rsync based state transfer
the donor node now acquires and owns LOCK_log for the duration of file
transfer during SST.

- fixes in innodb to skip wsrep processing (like kill victim) when running in native mysql mode
- similar fixes in mysql server side
- forcing tc_log_dummy in native mysql mode when no binlog used. wsrep hton messes up handler counter
  and used to lead in using tc_log_mmap instead. Bad news is that tc_log_mmap does not seem to work at all

Fix Galera crash at startup when compiled with gcc 6

Galera MTR Tests: increase timeouts and adjust some sporadically-failing tests so that the Galera suites can be run with --parallel=4

mysqld would crash with "double free or corrruption message"
if wrong provider version was given.

  Function "wsrep_row_upd_check_foreign_constraints" tried to mark
  fk-reference-table opened without ensuring it table is really opened.

If a conflict happens under wsrep_on, the THD's wsrep_conflict_state
is typically set to MUST_ABORT and cleared later, when transaction is
aborted. However, when wsrep_on is disabled, no check is performed to
see whether wsrep_conflict_state is set. So this potentially creates
spurious deadlock errors on the subsequent statement that runs with
wsrep_on enabled.
To avoid this problem wsrep_thd_set_conflict_state() sets the conflict
state only if wsrep_on is enabled.

Galera MTR Tests: Run galera_pc_weight on freshly started servers in order to prevent interaction with other tests

- At startup time global wsrep_on is set too late and some wsrep paths may be executed
  because of this. e.g. replication slave restart could happen before wsrep_on state is defined.
- This fix checks both global wsrep_on and wsrep_provider values to determine if wsrep
  processing should happen
- Fix affects all instances where WSREP_ON macro is used

Galera MTR Tests: force galera_3nodes.galera_pc_bootstrap.test to run on a fresh cluster in order to avoid interaction with galera_3nodes.galera_innobackupex_backup.test

Galera MTR Tests: Fortify galera_restart_nochanges.test against sporadic failures due to node not being ready immediately after restart