Also remove from Maven build step.

Author: JoshRosen

dev/run-tests.py

@@ -323,7 +323,7 @@ def get_hadoop_profiles(hadoop_version):
 def build_spark_maven(hadoop_version):
     # Enable all of the profiles for the build:
     build_profiles = get_hadoop_profiles(hadoop_version) + modules.root.build_profile_flags
-    mvn_goals = ["clean", "package", "-DskipTests"]
+    mvn_goals = ["clean", "package", "-DskipTests", "-pl", "!assembly"]
     profiles_and_goals = build_profiles + mvn_goals
 
     print("[info] Building Spark (w/Hive 1.2.1) using Maven with these arguments: ",