[CDM-84] Mark spark dependencies as provided

to exclude from the final jar, reducing the size
of shaded jar around 30MB.

Author: yukim

pom.xml

@@ -46,11 +46,13 @@
           <artifactId>log4j-slf4j-impl</artifactId>
         </exclusion>
       </exclusions>
+      <scope>provided</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.spark</groupId>
       <artifactId>spark-sql_${scala.main.version}</artifactId>
       <version>${spark.version}</version>
+      <scope>provided</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.spark</groupId>
@@ -66,6 +68,7 @@
           <artifactId>apache-log4j-extras</artifactId>
         </exclusion>
       </exclusions>
+      <scope>provided</scope>
     </dependency>
     <dependency>
       <groupId>com.datastax.spark</groupId>