FLUME-3368 Update Jackson to 2.9.10

Jackson has a serious security problem in 2.9.7, which will cause RCE (#327)

FasterXML/jackson-databind#2295

* Update pom.xml

Author: wcc526

pom.xml

@@ -62,7 +62,7 @@ limitations under the License.
     <curator.version>2.6.0</curator.version>
     <derby.version>10.14.1.0</derby.version>
     <elasticsearch.version>0.90.1</elasticsearch.version>
-    <fasterxml.jackson.version>2.9.7</fasterxml.jackson.version>
+    <fasterxml.jackson.version>2.9.10</fasterxml.jackson.version>
     <fest-reflect.version>1.4</fest-reflect.version>
     <geronimo-jms.version>1.1.1</geronimo-jms.version>
     <gson.version>2.2.2</gson.version>