[java client] Upgrade hadoop-client to 2.7.2
[java client] Upgrade hadoop-client to 2.7.2

With the old version, I was hitting HADOOP-10961 when running
kudu-mapreduce:TestOutputFormatJob locally. Now, the test passes. Strange
that this isn't happening in gerrit builds though.

Now we depend on upstream hadoop artifacts now instead of CDH artifacts.

Change-Id: I06ccff7acbd0286f2bd11c41474bf754e9eb5f56
Reviewed-on: http://gerrit.cloudera.org:8080/3849
Reviewed-by: Dan Burkert <2591e5f46f28d303f9dc027d475a5c60d8dea17a@cloudera.com>
Tested-by: Kudu Jenkins

helifu/kudu,helifu/kudu,cloudera/kudu,helifu/kudu,InspurUSA/kudu,helifu/kudu,EvilMcJerkface/kudu,InspurUSA/kudu,InspurUSA/kudu,andrwng/kudu,helifu/kudu,andrwng/kudu,EvilMcJerkface/kudu,andrwng/kudu,cloudera/kudu,InspurUSA/kudu,andrwng/kudu,EvilMcJerkface/kudu,EvilMcJerkface/kudu,InspurUSA/kudu,helifu/kudu,andrwng/kudu,InspurUSA/kudu,EvilMcJerkface/kudu,EvilMcJerkface/kudu,InspurUSA/kudu,helifu/kudu,cloudera/kudu,andrwng/kudu,cloudera/kudu,andrwng/kudu,helifu/kudu,InspurUSA/kudu,cloudera/kudu,helifu/kudu,EvilMcJerkface/kudu,cloudera/kudu,cloudera/kudu,EvilMcJerkface/kudu,andrwng/kudu,andrwng/kudu,cloudera/kudu,InspurUSA/kudu,cloudera/kudu,EvilMcJerkface/kudu