[SPARK-19064][PySpark]Fix pip installing of sub components#16465

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holdenk wants to merge 2 commits intoapache:masterfrom

holdenk:SPARK-19064-fix-pip-install-sub-components

Commits on Jan 4, 2017

Fix pip installing of sub components, and update the test and make-distribution scripts to be more explicit about cleanup. Also add pypandoc to dev requirements file since we want it for publishing
holdenk
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Install numpy so we can check the mllib linalg imports
holdenk
committed