added split path function and tests, inserted into _process.py

[loodvn]

Issue #, if available:
#245

Description of changes:

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[loodvn]

As described in https://github.com/aws/sagemaker-containers/issues/245, I can't seem to use an entry point that's nested inside my package.

In _process.py, we trim the ".py" extension from e.g. train.py and then run

python -m train

When the user-given entry point contains path seperators, this becomes

python -m my_package/train

, which causes an ImportError.

I have two proposed ideas for a fix:

• Replace path separators with periods
• If "/" exists in the entry point, change the entry point type to "python program", which means that my_package/train.py will run as a program.

I'm just not sure what side effects the second would have (by changing the entry point type), so I implemented the first so long.

[loodvn]

Oops, I just realised that with something like

setup.py
src/
  my_package/
    train.py

The above change would still give me src.my_package.train, instead of my_package.train.

Do you have any thoughts on this?

[laurenyu]

going to close this in favor of aws/sagemaker-python-sdk#941 (see #245)