HDFS-17759. Explicitly depend on jackson-core in hadoop-hdfs (#7508) Contributed by Istvan Toth.

Reviewed-by: PJ Fanning <fanningpj@apache.org>
Signed-off-by: Shilun Fan <slfan1989@apache.org>

hadoop-hdfs-project/hadoop-hdfs/pom.xml

@@ -218,6 +218,10 @@ https://maven.apache.org/xsd/maven-4.0.0.xsd">
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-databind</artifactId>
     </dependency>
+    <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-core</artifactId>
+    </dependency>
     <dependency>
       <groupId>org.apache.curator</groupId>
       <artifactId>curator-test</artifactId>