[SPARK-2413] Upgrade junit_xml_listener to 0.5.1

which fixes the following issues

1) fix the class name to be fully qualified classpath
2) make sure the the reporting time is in second not in miliseond, which causing JUnit HTML to report incorrect number
3) make sure the duration of the tests are accumulative.

Author: DB Tsai <dbtsai@alpinenow.com>

Closes #1333 from dbtsai/dbtsai-junit and squashes the following commits:

bbeac4b [DB Tsai] Upgrade junit_xml_listener to 0.5.1 which fixes the following issues

project/plugins.sbt

@@ -21,6 +21,6 @@ addSbtPlugin("org.scalastyle" %% "scalastyle-sbt-plugin" % "0.4.0")
 
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "0.1.6")
 
-addSbtPlugin("com.alpinenow" % "junit_xml_listener" % "0.5.0")
+addSbtPlugin("com.alpinenow" % "junit_xml_listener" % "0.5.1")
 
 addSbtPlugin("com.eed3si9n" % "sbt-unidoc" % "0.3.0")