[SPARK-18951] Upgrade com.thoughtworks.paranamer/paranamer to 2.6

## What changes were proposed in this pull request?
I recently hit a bug of com.thoughtworks.paranamer/paranamer, which causes jackson fail to handle byte array defined in a case class. Then I find https://github.com/FasterXML/jackson-module-scala/issues/48, which suggests that it is caused by a bug in paranamer. Let's upgrade paranamer. Since we are using jackson 2.6.5 and jackson-module-paranamer 2.6.5 use com.thoughtworks.paranamer/paranamer 2.6, I suggests that we upgrade paranamer to 2.6.

Author: Yin Huai <yhuai@databricks.com>

Closes #16359 from yhuai/SPARK-18951.

dev/deps/spark-deps-hadoop-2.2

@@ -128,7 +128,7 @@ objenesis-2.1.jar
 opencsv-2.3.jar
 oro-2.0.8.jar
 osgi-resource-locator-1.0.1.jar
-paranamer-2.3.jar
+paranamer-2.6.jar
 parquet-column-1.8.1.jar
 parquet-common-1.8.1.jar
 parquet-encoding-1.8.1.jar

dev/deps/spark-deps-hadoop-2.3

@@ -135,7 +135,7 @@ objenesis-2.1.jar
 opencsv-2.3.jar
 oro-2.0.8.jar
 osgi-resource-locator-1.0.1.jar
-paranamer-2.3.jar
+paranamer-2.6.jar
 parquet-column-1.8.1.jar
 parquet-common-1.8.1.jar
 parquet-encoding-1.8.1.jar

dev/deps/spark-deps-hadoop-2.4

@@ -135,7 +135,7 @@ objenesis-2.1.jar
 opencsv-2.3.jar
 oro-2.0.8.jar
 osgi-resource-locator-1.0.1.jar
-paranamer-2.3.jar
+paranamer-2.6.jar
 parquet-column-1.8.1.jar
 parquet-common-1.8.1.jar
 parquet-encoding-1.8.1.jar

dev/deps/spark-deps-hadoop-2.6

@@ -143,7 +143,7 @@ objenesis-2.1.jar
 opencsv-2.3.jar
 oro-2.0.8.jar
 osgi-resource-locator-1.0.1.jar
-paranamer-2.3.jar
+paranamer-2.6.jar
 parquet-column-1.8.1.jar
 parquet-common-1.8.1.jar
 parquet-encoding-1.8.1.jar

dev/deps/spark-deps-hadoop-2.7

@@ -144,7 +144,7 @@ objenesis-2.1.jar
 opencsv-2.3.jar
 oro-2.0.8.jar
 osgi-resource-locator-1.0.1.jar
-paranamer-2.3.jar
+paranamer-2.6.jar
 parquet-column-1.8.1.jar
 parquet-common-1.8.1.jar
 parquet-encoding-1.8.1.jar

pom.xml

@@ -179,7 +179,7 @@
     <antlr4.version>4.5.3</antlr4.version>
     <jpam.version>1.1</jpam.version>
     <selenium.version>2.52.0</selenium.version>
-    <paranamer.version>2.8</paranamer.version>
+    <paranamer.version>2.6</paranamer.version>
     <maven-antrun.version>1.8</maven-antrun.version>
     <commons-crypto.version>1.0.0</commons-crypto.version>
 
@@ -1863,6 +1863,11 @@
           </exclusion>
         </exclusions>
       </dependency>
+      <dependency>
+        <groupId>com.thoughtworks.paranamer</groupId>
+        <artifactId>paranamer</artifactId>
+        <version>${paranamer.version}</version>
+      </dependency>
     </dependencies>
   </dependencyManagement>