backend: fix username in console connected/disconnected events.

In all audits comming from commands the username does not
include the domain, so in these two commands where the event
is created explicitly, domain name should be removed.

Change-Id: I6792cc4bf147dc6eced646b359537ee126341ac9
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1079208
Signed-off-by: Mooli Tayer <mtayer@redhat.com>