add jetty dep

Author: echarles

resource-managers/kubernetes/core/pom.xml

@@ -39,6 +39,15 @@
       <version>${project.version}</version>
     </dependency>
 
+    <!--
+      jetty scope is defined as `provided` in parent pom.
+    -->
+    <dependency>
+      <groupId>org.eclipse.jetty</groupId>
+      <artifactId>jetty-servlet</artifactId>
+      <version>${jetty.version}</version>
+    </dependency>
+
     <dependency>
       <groupId>org.apache.spark</groupId>
       <artifactId>spark-core_${scala.binary.version}</artifactId>