References lp:1240924 - added regression tests for lp:587170, removed stale wsrep_local_bf_aborts. Synced with SVN r 3367. References lp:1180792 - Galera status variables are no longer implicitly reset to initial values when quering them. Added support for explicit status variables reset. Added flow_control_paused_ns variable that produces total time (nanoseconds) that provider was paused.