quiet DRD error reports

testget

Complaint is of race between wait and Context cleanup.
shared_ptr<info_t> probably makes this safe, but
no down-side to explicit shutdown.

test/testget.cpp

@@ -300,6 +300,7 @@ struct Tester {
         cli.hurryUp();
 
         testOk1(!info->done.wait(2.1));
+        cli.close();
     }
 
     void orphan()