carto/protobuf @ php-generated-dev

Yilun Chong c3566c6861 Fix python install, cat java error log for kokoro build		7 lat temu
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linux	c3566c6861 Fix python install, cat java error log for kokoro build	7 lat temu
macos	204a6413d6 Move kokoro macOS builds to to Xcode 9.1.	7 lat temu
README.md	6156af10e8 Add MacOS and Linux tests to Kokoro	8 lat temu

Kokoro Infrastructure

The files in this directory serve as plumbing for running Protobuf tests under Kokoro, our internal CI.