Rewrite tests from tap to luatest

[ArtDu]

#52 (comment)

[ligurio]

TAP tests require more than one parameter

test:
        .rocks/bin/luatest -v
        rm -rf ${CLEANUP_FILES}
        INDEX_TYPE='TREE' SPACE_TYPE='vinyl' ./test.lua
        rm -rf ${CLEANUP_FILES}
        INDEX_TYPE='HASH' ./test.lua
        rm -rf ${CLEANUP_FILES}
        INDEX_TYPE='TREE' ./test.lua
        rm -rf ${CLEANUP_FILES}

but parameterization with more than one parameter is in progress feature -
tarantool/luatest#163

[ligurio]

luatest 0.5.5 includes parameterize support
tarantool/luatest@717cf1d