Changes:

1) Add initialization for trx->xid in InnoDB trx pool

2) Add server UUID in the XID of InnoDB SR transactions

3) Modify trx_recover_for_mysql_callback() so that recovered InnoDB SR
transactions are not made visible to MySQL as recovered XA transactions.

4) Modify how SR transactions are detected and the wsrep_is_sr flag is
set for InnoDB SR transactions.

include/wsrep/storage_service.hpp

@@ -82,6 +82,10 @@ namespace wsrep
          */
         virtual int remove_fragments() = 0;
 
+#ifdef WITH_WSREP_SR_SPEEDUP
+	int set_fragments_from_table() {return 0;};
+#endif /* WITH_WSREP_SR_SPEEDUP */
+
         /**
          * Commit the transaction.
          */