[Spark-13331] Spark RPC encryption optimization

Remove some unnecessary import and changes.

Author: Junjie Chen

common/network-common/pom.xml

@@ -76,6 +76,11 @@
       <artifactId>guava</artifactId>
       <scope>compile</scope>
     </dependency>
+    <dependency>
+      <groupId>org.apache.commons</groupId>
+      <artifactId>commons-crypto</artifactId>
+      <version>${commons-crypto.version}</version>
+    </dependency>
 
     <!-- Test dependencies -->
     <dependency>
@@ -97,11 +102,6 @@
       <artifactId>slf4j-log4j12</artifactId>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>org.apache.commons</groupId>
-      <artifactId>commons-crypto</artifactId>
-      <version>${commons-crypto.version}</version>
-    </dependency>
   </dependencies>
 
   <build>

common/network-common/src/main/java/org/apache/spark/network/sasl/SaslServerBootstrap.java

@@ -29,6 +29,7 @@
  * authentication.
  */
 public class SaslServerBootstrap implements TransportServerBootstrap {
+
   private final TransportConf conf;
   private final SecretKeyHolder secretKeyHolder;
 

common/network-common/src/main/java/org/apache/spark/network/util/TransportConf.java

@@ -18,8 +18,7 @@
 package org.apache.spark.network.util;
 
 import com.google.common.primitives.Ints;
-import io.netty.handler.ssl.CipherSuiteFilter;
-import org.apache.commons.crypto.cipher.CryptoCipherFactory;
+
 /**
  * A central location that tracks all the settings we expose to users.
  */

common/network-common/src/test/java/org/apache/spark/network/sasl/SparkSaslSuite.java

@@ -41,7 +41,6 @@
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelOutboundHandlerAdapter;
 import io.netty.channel.ChannelPromise;
-import org.apache.spark.network.sasl.aes.SparkAesCipher;
 import org.junit.Test;
 import org.mockito.invocation.InvocationOnMock;
 import org.mockito.stubbing.Answer;
@@ -54,6 +53,7 @@
 import org.apache.spark.network.client.RpcResponseCallback;
 import org.apache.spark.network.client.TransportClient;
 import org.apache.spark.network.client.TransportClientBootstrap;
+import org.apache.spark.network.sasl.aes.SparkAesCipher;
 import org.apache.spark.network.server.RpcHandler;
 import org.apache.spark.network.server.StreamManager;
 import org.apache.spark.network.server.TransportServer;