Implement blueprint: 'feature-feeder-in-core'.

box replication test was updated:
 - common test was splited on three test:
    * hot_standby test -- check replication from hot_standby server
        * swap -- this test iteratively swap services roles (master to
                  replica, replica to master)
        * consistent -- this is test check replica data consistent
 - unused configuration files was deleted.
 - get_param method to tarantool_to_slave