[SPARK-28290][CORE][SQL] Use SslContextFactory.Server instead of SslContextFactory

## What changes were proposed in this pull request?

`SslContextFactory` is deprecated at Jetty 9.4 and we are using `9.4.18.v20190429`. This PR aims to replace it with `SslContextFactory.Server`.
- https://www.eclipse.org/jetty/javadoc/9.4.19.v20190610/org/eclipse/jetty/util/ssl/SslContextFactory.html
- https://www.eclipse.org/jetty/javadoc/9.3.24.v20180605/org/eclipse/jetty/util/ssl/SslContextFactory.html

```
[WARNING] /Users/dhyun/APACHE/spark/core/src/main/scala/org/apache/spark/SSLOptions.scala:71:
constructor SslContextFactory in class SslContextFactory is deprecated:
see corresponding Javadoc for more information.
[WARNING]       val sslContextFactory = new SslContextFactory()
[WARNING]                               ^
```

## How was this patch tested?

Pass the Jenkins with the existing tests.

Closes apache#25067 from dongjoon-hyun/SPARK-28290.

Authored-by: Dongjoon Hyun <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

Author: dongjoon-hyun

core/src/main/scala/org/apache/spark/SSLOptions.scala

@@ -68,7 +68,7 @@ private[spark] case class SSLOptions(
    */
   def createJettySslContextFactory(): Option[SslContextFactory] = {
     if (enabled) {
-      val sslContextFactory = new SslContextFactory()
+      val sslContextFactory = new SslContextFactory.Server()
 
       keyStore.foreach(file => sslContextFactory.setKeyStorePath(file.getAbsolutePath))
       keyStorePassword.foreach(sslContextFactory.setKeyStorePassword)

sql/hive-thriftserver/v1.2.1/src/main/java/org/apache/hive/service/cli/thrift/ThriftHttpCLIService.java

@@ -86,7 +86,7 @@ public void run() {
           throw new IllegalArgumentException(ConfVars.HIVE_SERVER2_SSL_KEYSTORE_PATH.varname
               + " Not configured for SSL connection");
         }
-        SslContextFactory sslContextFactory = new SslContextFactory();
+        SslContextFactory sslContextFactory = new SslContextFactory.Server();
         String[] excludedProtocols = hiveConf.getVar(ConfVars.HIVE_SSL_PROTOCOL_BLACKLIST).split(",");
         LOG.info("HTTP Server SSL: adding excluded protocols: " + Arrays.toString(excludedProtocols));
         sslContextFactory.addExcludeProtocols(excludedProtocols);

sql/hive-thriftserver/v2.3.5/src/main/java/org/apache/hive/service/cli/thrift/ThriftHttpCLIService.java

@@ -87,7 +87,7 @@ public void run() {
           throw new IllegalArgumentException(ConfVars.HIVE_SERVER2_SSL_KEYSTORE_PATH.varname
               + " Not configured for SSL connection");
         }
-        SslContextFactory sslContextFactory = new SslContextFactory();
+        SslContextFactory sslContextFactory = new SslContextFactory.Server();
         String[] excludedProtocols = hiveConf.getVar(ConfVars.HIVE_SSL_PROTOCOL_BLACKLIST).split(",");
         LOG.info("HTTP Server SSL: adding excluded protocols: " + Arrays.toString(excludedProtocols));
         sslContextFactory.addExcludeProtocols(excludedProtocols);