[MLLIB] make Mima ignore updateFeatures (private) in ALS

Fix Mima issues in #1521.

Author: Xiangrui Meng <meng@databricks.com>

Closes #1533 from mengxr/mima-als and squashes the following commits:

78386e1 [Xiangrui Meng] make Mima ignore updateFeatures (private) in ALS

project/MimaExcludes.scala

@@ -82,7 +82,9 @@ object MimaExcludes {
         ProblemFilters.exclude[MissingMethodProblem]( // The only public constructor is the one without arguments.
           "org.apache.spark.mllib.recommendation.ALS.this"),
         ProblemFilters.exclude[MissingMethodProblem](
-          "org.apache.spark.mllib.recommendation.ALS.org$apache$spark$mllib$recommendation$ALS$$<init>$default$7")
+          "org.apache.spark.mllib.recommendation.ALS.org$apache$spark$mllib$recommendation$ALS$$<init>$default$7"),
+        ProblemFilters.exclude[IncompatibleMethTypeProblem](
+          "org.apache.spark.mllib.recommendation.ALS.org$apache$spark$mllib$recommendation$ALS$^dateFeatures")
       ) ++
       MimaBuild.excludeSparkClass("mllib.linalg.distributed.ColumnStatisticsAggregator") ++
       MimaBuild.excludeSparkClass("rdd.ZippedRDD") ++