workaround, not a fix: don't build key management plugins in yassl builds

when page compression and google encryption is used.

because old openssl versions (e.g. on labrador) don't have it

but do MyISAM first - to read mysql.plugin table

- Fixed compiler warnings
- Added include/wait_for_binlog_checkpoint.inc, as suggested by JonasO
- Updated 'build-tags' to work with git (Patch by Serg)

Added an extra column to i_s_applicable_roles, named IS_DEFAULT.
The column displays which role is the default role for the user
querying the table.

add missing plugins to debs

Adjust the configuration options, as discussed on the
maria-developers@ mailing list.

The option to hint a transaction to not be replicated in parallel is
now called @@skip_parallel_replication, consistent with
@@skip_replication.

And the --slave-parallel-mode is now simplified to have just one of
the following values:

  none
  minimal
  conservative
  optimistic
  aggressive

This reflects successively harder efforts to find opportunities to run
things in parallel on the slave. It allows to extend the server with
more automatic heuristics in the future without having to introduce a
new configuration option for each and every one.

(Without this, it happened for me that realpath() failed returning
undef for the default vardir. This in turn caused mysql-test-run.pl to
delete the source mysql-test/ directory.)

pool->threads is freed before being reassigned the new pool.

Although not really a memory barrier I though it prudent to keep the pool
thread count to be the lower of the old/new thread list before the new threads
is allocated.

to be able disable wsrep before any further code that uses it
(e.g. initialized binlog when wsrep is enabled)

            fails in buildbot)

There was a race condition in timer functionality of query timeouts.

Race was as following:
main thread:          init_thr_timers()
timer handler thread: my_thread_init()
main thread:          end_thr_timer()/timer_thread_state= ABORTING
timer handler thread: timer_thread_state= RUNNING, continue normal op
main thread:          waits indefinitely for timer handler thread to go down

The original idea of the fix is to set RUNNING state in main thread, before
starting timer handler thread. But it didn't survive further cleanups:
- removed "timer_thread_state" and used "thr_timer_inited" for this purpose
- removed unused "timer_thread_running"
- removed code responisble for "timer handler thread" shutdown synchronization,
  use pthread_join() instead.

INFORMATION_SCHEMA.SYSTEM_VARIABLES.DEFAULT_VALUE had broken values on
big endian.

Default value is internally stored as longlong, while I_S references it's
pointer (longlong *) according to variable type (e.g. int, my_bool, etc). This
works well on little endian, but on big endian we always get 0 for such
variables.

This is temporal test fixt to avoid concurrent IST for now until
the actual issue https://github.com/codership/galera/issues/204
is fixed.

With commit 227510e0 (parser cleanup: don't store field properties in LEX,
use Create_field directly) it became possible to create columns DOUBLE(0,0) and alike

Added options for each compression type that can be disabled i.e.
bzip2, lz4, lzma and lzo.

* reset current_thd in THD::~THD, otherwise my_malloc_size_cb_func()
  might access THD after it was destroyed.
* remove now redundant set_current_thd(0) calls that follow delete thd.