Avoid reproducable mysqld crashes with signal 11

[OpenStack Infra]

https://review.openstack.org/294173
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.

commit a3fdf7faf7fbcb4243151787a28c6f03cb148fc1
Author: Dmitry Bilunov <email address hidden>
Date: Thu Mar 17 19:43:32 2016 +0300

    Avoid reproducable mysqld crashes with signal 11

    mysqld clears the transaction cache by calling
    thd->binlog_flush_pending_rows_event(1);

    It crashes mysqld if wsrep_emulate_bin_log is ON and binlogs are
    disabled.

    https://github.com/codership/mysql-wsrep/issues/112

    This patch worksaround this bug by enabling binlogs and setting low
    rotation values to avoid running out of disk space.

    Please revert this patch after the upstream bug is fixed.

    DocImpact: mysql binary logs enabled by default and new mysql hiera
    options have been added to allow for configuration of binlog retention.
    Closes-Bug: #1541338
    Partial-Bug: #1558632

    Change-Id: I7c7a4dcf4ab6b8b17e7d4be5fe05088b6917d15b

[Olena Logvinova (ologvinova)]

The patch with DocImpact note https://review.openstack.org/#/c/294173/ (that automatically created this doc bug) was reverted. Therefore, there is nothing to update in docs. Marking bug as Invalid.