[SPARK-18575][WEB] Keep same style: adjust the position of driver log links

## What changes were proposed in this pull request?

NOT BUG, just adjust the position of driver log link to keep the same style with other executors log link.

![image](https://cloud.githubusercontent.com/assets/7402327/20590092/f8bddbb8-b25b-11e6-9aaf-3b5b3073df10.png

)

## How was this patch tested?
 no

Author: uncleGen <hustyugm@gmail.com>

Closes #16001 from uncleGen/SPARK-18575.

(cherry picked from commit f58a8aa2)
Signed-off-by: Sean Owen <sowen@cloudera.com>

yarn/src/main/scala/org/apache/spark/scheduler/cluster/YarnClusterSchedulerBackend.scala

@@ -55,8 +55,8 @@ private[spark] class YarnClusterSchedulerBackend(
       val baseUrl = s"$httpScheme$httpAddress/node/containerlogs/$containerId/$user"
       logDebug(s"Base URL for logs: $baseUrl")
       driverLogs = Some(Map(
-        "stderr" -> s"$baseUrl/stderr?start=-4096",
-        "stdout" -> s"$baseUrl/stdout?start=-4096"))
+        "stdout" -> s"$baseUrl/stdout?start=-4096",
+        "stderr" -> s"$baseUrl/stderr?start=-4096"))
     } catch {
       case e: Exception =>
         logInfo("Error while building AM log links, so AM" +