Merge remote-tracking branch 'origin/1.6' into 1.7

CMakeLists.txt

README.md

debian/control

doc/sphinx/book/box/index.rst

doc/sphinx/book/configuration/cfg-logging.rst

doc/sphinx/book/configuration/cfg-storage.rst

doc/sphinx/dev_guide/building_from_source.rst

doc/sphinx/reference/crypto.rst

doc/sphinx/reference/digest.rst

doc/sphinx/reference/fiber.rst

doc/sphinx/reference/fio.rst

extra/dist/example.lua

extra/dist/tarantoolctl.in

extra/schema_erase.lua

extra/schema_fill.lua

rpm/tarantool.spec

src/CMakeLists.txt

src/box/CMakeLists.txt

src/box/bootstrap.snap

src/box/lua/index.c