[issue38662] Decouple ensurepip from pip's internals using runpy

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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components: +Library (Lib)
versions:  -Python 2.7, Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38662>
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