[build system] java package updates on the amplab jenkins workers

[shane knapp <sk...@berkeley.edu>]

i've installed the latest java 7 and 8 packages on all of the jenkins workers!

i haven't updated the /usr/java/latest and /usr/java/default symlinks
to point to the new java 7 package, as i'd like to wait for downtime
when no builds are running.  switching java versions mid-build might
be fun, but also might cause failures and weird behavior.  this
downtime will happen once voting is done for spark 1.5 and the release
is cut.

however, java 8 is ready to go!  tests can be configured to point
JAVA_HOME at /usr/java/jdk1.8.0_60

related JIRAs:
https://issues.apache.org/jira/browse/SPARK-10455
https://issues.apache.org/jira/browse/SPARK-10456

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