[SPARK-7678] [ml] Fix default random seed in HasSeed#6251

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jkbradley wants to merge 2 commits intoapache:masterfrom

jkbradley:scala-fixed-seed

Commits on May 19, 2015

Removed fixed random seeds from Word2Vec and ALS. Changed shared param HasSeed to have default based on hashCode of class name, instead of random number.
jkbradley
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Fixed Word2VecSuite, ALSSuite in spark.ml to use original fixed random seeds
jkbradley
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