Correct some leaks in unit tests.

* chan_sip: channel in test_sip_rtpqos_1.
* test_config: config hook, config info and global config holder.
* test_core_format: format in format_attribute_set_without_interface.
* test_stream: unneeded frame duplication.
* test_taskprocessor: task_data.

Change-Id: I94d364d195cf3b3b5de2bf3ad565343275c7ad31

channels/sip/dialplan_functions.c

@@ -484,6 +484,9 @@ done:
 		dialog_unlink_all(p);
 		dialog_unref(p, "Destroy test object");
 	}
+	if (chan) {
+		ast_channel_unref(chan);
+	}
 	ast_rtp_engine_unregister(&test_engine);
 	return res;
 }