The changes:

* merged most of Seppo's changes by hand
 * enabled the replay of SR speedup feature
 * changed how binlog_cache is retrieved for SR speedup
 * moved set_fragments_from_table() to
   Wsrep_schema::recover_sr_transactions()
 * improved handling the "wsrep_is_sr" flags

Several MTR tests still fail, for example galera_sr.GCF-900

include/wsrep/transaction.hpp

@@ -144,6 +144,7 @@ namespace wsrep
         int xa_replay(wsrep::unique_lock<wsrep::mutex>&);
 #ifdef WITH_WSREP_SR_SPEEDUP
 	int set_fragments_from_table();
+	void *get_binlog_cache();
 #endif /* WITH_WSREP_SR_SPEEDUP */
 
         bool pa_unsafe() const { return pa_unsafe_; }