spark git commit: [SPARK-11912][ML] ml.feature.PCA minor refactor

Repository: spark Updated Branches: refs/heads/master fc4b792d2 -> d9cf9c21f [SPARK-11912][ML] ml.feature.PCA minor refactor Like [SPARK-11852](https://issues.apache.org/jira/browse/SPARK-11852), ```k``` is params and we should save it under ```metadata/``` rather than both under

spark git commit: [SPARK-11912][ML] ml.feature.PCA minor refactor

Repository: spark Updated Branches: refs/heads/branch-1.6 7f9d3358a -> d482dced3 [SPARK-11912][ML] ml.feature.PCA minor refactor Like [SPARK-11852](https://issues.apache.org/jira/browse/SPARK-11852), ```k``` is params and we should save it under ```metadata/``` rather than both under