src.ctf.lttng-live: use viewer_connection_close_socket more

src.ctf.lttng-live: use viewer_connection_close_socket more

Use viewer_connection_close_socket at all spots we close the control
socket, to de-duplicate code a little bit.

Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Change-Id: I47ce5bf00edd367792a8f8262d746a61b0c474fd
Reviewed-on: https://review.lttng.org/c/babeltrace/+/8484
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/12394
Tested-by: jenkins <jenkins@lttng.org>