Merge branch 'master-valgrind'

core/admin.m

core/admin.rl

core/fiber.m

core/log_io.m

core/palloc.m

core/replication.m

core/stat.m

core/tarantool.m

include/fiber.h

include/log_io.h

include/palloc.h

include/stat.h

include/tarantool.h

mod/box/box.m

mod/box/box_lua.m

mod/box/index.h

mod/box/index.m

test/box/admin.result

test/box/admin.test

test/box/admin_coredump.result