Merge branch 'master-stable'

CMakeLists.txt

core/CMakeLists.txt

core/log_io.c

core/tarantool.c

core/util.c

include/config.h.cmake

include/log_io.h

include/tarantool.h

test/box/args.result

test/box/args.test

test/box/bug726778.cfg

test/box/show.result

test/box/tarantool.cfg

test/box/tarantool_bad2.cfg

test/box/tarantool_bad3.cfg

test/box/tarantool_bad4.cfg

test/box/tarantool_bad5.cfg

test/box/tarantool_good.cfg