Merge branch 'box-switch_mode'

cfg/tarantool_box_cfg.c

cfg/tarantool_box_cfg.h

cfg/tarantool_feeder_cfg.c

cfg/tarantool_feeder_cfg.h

core/CMakeLists.txt

core/fiber.m

core/latch.m

core/log_io_remote.m

core/tarantool.m

include/exceptions.h

include/fiber.h

include/latch.h

include/tarantool.h

mod/box/box.m

mod/box/box_cfg.cfg_tmpl

mod/feeder/feeder.m

test/box_replication/common.result

test/box_replication/common.test

test/box_replication/feeder.cfg

test/box_replication/feeder_secondary.cfg