Merge branch 'master' of https://github.com/tarantool/tarantool

extra/dist/tarantoolctl

src/box/box.cc

src/box/errcode.h

src/box/lua/schema.lua

src/box/memtx_engine.cc

src/box/recovery.cc

src/box/recovery.h

src/box/sophia_engine.cc

src/box/vclock.c

src/box/vclock.h

src/box/xlog.cc

src/box/xlog.h

src/fiber.cc

test/box/misc.result

test/box/role.result

test/box/role.test.lua

test/unit/fiber.result

test/unit/vclock.cc

test/xlog/errinj.result

test/xlog/errinj.test.lua