Skip Scala tests for now

Author: HyukjinKwon

dev/run-tests.py

@@ -637,7 +637,7 @@ def main():
         build_spark_assembly_sbt(hadoop_version, should_run_java_style_checks)
 
     # run the test suites
-    run_scala_tests(build_tool, hadoop_version, test_modules, excluded_tags)
+    # run_scala_tests(build_tool, hadoop_version, test_modules, excluded_tags)
 
     modules_with_python_tests = [m for m in test_modules if m.python_test_goals]
     if modules_with_python_tests: