Making changes to wsrep_mysqld.h causes large parts of server code to
be recompiled. The reason is that wsrep_mysqld.h is included by
sql_class.h, even tough very little of wsrep_mysqld.h is needed in
sql_class.h. This commit introduces a new header file, wsrep_on.h,
which is meant to be included from sql_class.h, and contains only
macros and variable declarations used to determine whether wsrep is
enabled.
Also, header wsrep.h should only contain definitions that are also
used outside of sql/. Therefore, move WSREP_TO_ISOLATION* and
WSREP_SYNC_WAIT macros to wsrep_mysqld.h.

Reviewed-by: Jan Lindström <jan.lindstrom@mariadb.com>

Problem:
========
When using sequences, the function
sequence_definition::write(TABLE *table, bool all_fields)
is used to save DML/DDL updates to sequence tables (e.g. nextval,
setval, and alter). Prior to this patch, the value all_fields was
always false when invoked via nextval and setval, which forced the
bitmap to only include changed columns.

Solution:
========
Change all_fields when invoked via nextval and setval to be reliant
on binlog_row_image, such that it is false when binlog_row_image is
MINIMAL, and true otherwise.

Reviewed By:
===========
Andrei Elkin <andrei.elkin@mariadb.com>

Sequence storage engine is not transactionl so cache will be written in
stmt_cache that is not replicated in cluster. To fix this replicate
what is available in both trans_cache and stmt_cache.

Sequences will only work when NOCACHE keyword is used when sequnce is
created. If WSREP is enabled and we don't have this keyword report error
indicting that sequence will not work correctly in cluster.

When binlog is enabled statement cache will be cleared in transaction
before COMMIT so cache generated from sequence will not be replicated.
We need to keep cache until replication.

Tests are re-recorded because of replication changes that were
introducted with this PR.

Reviewed-by: Jan Lindström <jan.lindstrom@mariadb.com>

Task 3:
Added an additional condition for SEQUENCE option to check if cache < 0.