[SPARK-20677][MLLIB][ML] Follow-up to ALS recommend-all performance PRs#17919

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MLnick wants to merge 4 commits intoapache:masterfrom

MLnick:SPARK-20677-als-perf-followup

Commits on May 9, 2017

Use F2jBLAS and clean up code
Nick Pentreath
committed
mllib version
Nick Pentreath
committed
No need for 'recommendation' private scope
Nick Pentreath
committed

Commits on May 11, 2017

Expose {ml, mllib}-private f2jBLAS and use that
Nick Pentreath
committed