Update jacoco artifact id.

5 jobs for master in 1 minute and 9 seconds (queued for 9 minutes and 43 seconds)
Name Stage Failure
java8 Build
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
15246 [ERROR]
15246 [ERROR] Re-run Maven using the -X switch to enable full debug logging.
15247 [ERROR]
15247 [ERROR] For more information about the errors and possible solutions, please read the following articles:
15247 [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginResolutionException
ERROR: Job failed: exit code 1