remove direct spark-core test jar dependency

Author: sryza

sql/pipelines/pom.xml

@@ -48,13 +48,6 @@
             <artifactId>spark-core_${scala.binary.version}</artifactId>
             <version>${project.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.apache.spark</groupId>
-            <artifactId>spark-core_${scala.binary.version}</artifactId>
-            <version>${project.version}</version>
-            <type>test-jar</type>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>org.apache.spark</groupId>
             <artifactId>spark-sql_${scala.binary.version}</artifactId>