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SDK/Lightweight - Disabled code pickling by default (#1512)

I've introduced code pickling to capture dependencies in https://github.com/kubeflow/pipelines/pull/1372
Later I've discovered that there is a serious opcode incompatibility between python versions 3.5 and 3.6+. See my analysis of the issue: https://github.com/cloudpipe/cloudpickle/issues/293

Dues to this issue I decided to switch back to using source code copying by default and to continue improving it.

Until we stop supporting python 3.5 (https://github.com/kubeflow/pipelines/pull/668) it's too dangerous to use code pickling by default.

Code pickling can be enabled by specifying `pickle_code=True` when calling `func_to_container_op`

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