[ML-3584] Added benchmarks to mllib-large.yaml for ALS (#147)

Benchmark for ALS is added to mllib-large.yaml.
Then parameters is based on the previous benchmarks for the Spark 2.2 QA. It has been tested for the stability under the same cluster setting for other benchmarks (classifcation).

src/main/resources/com/databricks/spark/sql/perf/mllib/config/mllib-large.yaml

@@ -37,3 +37,12 @@ benchmarks:
       numFeatures: 5000
       numClasses: 2
       smoothing: 1.0
+  - name: recommendation.ALS
+    params:
+      numExamples: 50000000
+      numTestExamples: 50000000
+      numUsers: 6000000
+      numItems: 6000000
+      regParam: 0.01
+      rank: 10
+      maxIter: 10