Blueprint 'Enable manual slave-to-master propagation': review fixes.

cfg/tarantool_box_cfg.c

cfg/tarantool_box_cfg.h

cfg/tarantool_feeder_cfg.c

cfg/tarantool_feeder_cfg.h

core/CMakeLists.txt

core/latch.m

core/log_io_remote.m

core/tarantool.m

include/latch.h

include/tarantool.h

mod/box/box.m

mod/feeder/feeder.m

test/box_replication/common.test

test/box_replication/feeder.cfg

test/box_replication/feeder_slave.cfg

test/box_replication/tarantool.cfg

test/box_replication/tarantool_beholder.cfg

test/box_replication/tarantool_beholder_to_slave.cfg

test/box_replication/tarantool_slave.cfg

test/box_replication/tarantool_slave_to_master.cfg