Fix: text output missing separator when printing the domain

Fix: text output missing separator when printing the domain

With the "-f all" option, we expect to see
<hostname>:<domain>:<loglevel>, but instead we see
<hostname><domain>:<loglevel>.

Judging from the pattern of the other printed fields, the check for
"dom_print" variable seems to be missing when printing the domain.

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>