Merge test/big/ into test/box/

test/big/big.lua

test/big/sql.result

test/big/sql.test.lua

test/big/suite.ini

test/box/admin.result

test/box/bitset.result

test/box/bitset.test.lua

test/box/box.lua

test/box/cfg.result

test/box/errinj.result

test/box/errinj.test.lua

test/box/hash.result

test/box/hash.test.lua

test/box/hash_multipart.result

test/box/hash_multipart.test.lua

test/box/iterator.result

test/box/iterator.test.lua

test/box/lua.result

test/box/lua.test.lua

test/box/lua/bitset.lua