Define sbt_test_goals for yarn module.

Author: Marcelo Vanzin

dev/sparktestsupport/modules.py

@@ -411,6 +411,10 @@ def contains_file(self, filename):
         "yarn/",
         "network/yarn/",
     ],
+    sbt_test_goals=[
+        "yarn/test",
+        "network-yarn/test",
+    ],
     test_tags=[
         "org.apache.spark.deploy.yarn.ExtendedYarnTest"
     ]