Enable basic XA between MyRocks and the binlog

This allows basic master crash-safety
- Un-comment and update relevant parts of the code
- Make rocksdb_rpl suite work like other MyRocks testsuites
  (load the MyRocks plugin, don't start if it is not compiled in, etc)
- For now, disable all tests in the rocksdb_rpl suite.
- MariaDB-fication of rpl_rocksdb_2p_crash_recover test.

storage/rocksdb/rdb_datadic.h

@@ -1082,7 +1082,6 @@ public:
   bool init(Rdb_dict_manager *const dict);
   void cleanup();
   void update(const char *const binlog_name, const my_off_t binlog_pos,
-              const char *const binlog_max_gtid,
               rocksdb::WriteBatchBase *const batch);
   bool read(char *const binlog_name, my_off_t *const binlog_pos,
             char *const binlog_gtid) const;