make the R hdfs tests run again. They still go to the cdh3 cluster on 176

details:

I rebuilt the cdh3 cluster on 172-177. We always had the latest cm4 (cloudera manager 4) on our cdh3. Problem ocurred when updating all systems to the 12.04 LTS HWE stack which is the 3.11 kernel. Consistency everywhere for maintenance issues (for instance docker evidently doesn't support <3.8). Also: updates were no l
onger being released for the 3.2.x based stack.

Apparently cm4 doesn't work on the 3.11 kernel, apparently some different schema
 passing the heartbeat for the nodes. So I rolled back to the normal 12.04 LTS 3
.2.x stack on 174-177 (which are the nodes for the cdh3 cluster now)

All other systems were updated last week to 12.04 LTS HWE (3.11.x kernel).
(this is the same kernel as the Ubuntu Trusty release)

171 was not rebooted, so it has the pending update. If 171 is rebooted and somet
hing doesn't work, let me know. Things have been fine everywhere (cdh5 and hdp2.1 seem fine. I just checked win8.1_x64 on virtualbox and that's fine too. Samba seems fine.

No plans to update to 14.04 LTS.
ease enter the commit message for your changes. Lines starting