tests: use box.schema.space.create rather than create_space

test/app/float_value.test.lua

test/app/init_script.test.lua

test/app/trigger_atexit.test.lua

test/big/hash.result

test/big/hash.test.lua

test/big/hash_multipart.result

test/big/hash_multipart.test.lua

test/big/iterator.result

test/big/iterator.test.lua

test/big/lua.result

test/big/lua.test.lua

test/big/sql.result

test/big/sql.test.py

test/big/tree_pk.result

test/big/tree_pk.test.lua

test/big/tree_pk_multipart.result

test/big/tree_pk_multipart.test.lua

test/big/tree_variants.result

test/big/tree_variants.test.lua

test/box/access.result