logging: Use default timeout of 120 seconds for virtlogd

This is the same timeout of all other daemons, and just like them
virtlogd is socket-activated, so it will automatically be started
on demand whenever that's necessary.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NDaniel Henrique Barboza <danielhb413@gmail.com>

src/logging/virtlogd.sysconf

 #
 # Pass extra arguments to virtlogd
-#VIRTLOGD_ARGS=
+VIRTLOGD_ARGS="--timeout 120"