Added simple test for HBase query

com.oracle.truffle.r.test/tests/hbase/QuerySimple.R

+emp = new.table("emp", "HBase", "hbase-site.xml", "default")
+q = select(function (x) { res = new.env(); res$ename = x$ename; res },
+    from(emp))
+results = query.force(q)
+for (r in results) { print (r$ename) }