qa/workunits/hadoop-wordcount: use -x

Signed-off-by: Sage Weil <sage@redhat.com>
qa/workunits/hadoop-wordcount: fix/use -rmr command

-rm -r -f ... doesn't seem to work; use -rmr instead.

Signed-off-by: Sage Weil <sage@redhat.com>
qa/workunits/hadoop: move all hadoop tests into a hadoop/ dir

Signed-off-by: Sage Weil <sage@redhat.com>
Merge pull request #2279 from ceph/wip-hadoop

fix and reorg hadoop workunits

Reviewed-by: Greg Farnum <greg@inktank.com>