Fix rm-data hanging when some OSDs are inactive, add a test for it

There's also another case which also needs to be fixed - we shouldn't retry
deletions for indefinite time if an OSD is stopped during deletion

src/cmd/cli_rm.cpp

@@ -230,6 +230,7 @@ resume_100:
         {
             result.data = my_result(result.data);
             state = 100;
+            return false;
         }
         else if (parent->progress)
             printf("%s\n", result.text.c_str());