Merge branch 'tt-refactor'

test/big/bitset.result

test/big/bitset.test

test/big/hash.result

test/big/hash.test

test/big/hash_multipart.result

test/big/hash_multipart.test

test/big/iterator.result

test/big/iterator.test

test/big/lua.result

test/big/lua.test

test/big/sql.result

test/big/sql.test

test/big/suite.ini

test/big/tree_pk.result

test/big/tree_pk.test

test/big/tree_pk_multipart.result

test/big/tree_pk_multipart.test

test/big/tree_variants.result

test/big/tree_variants.test

test/box/cjson.result