device: don't wait udev for devices created by us

If we created a software interface it is because we already decided
that it should be managed, and so there is no point in waiting udev to
check that the interface is not udev-unmanaged.

We still wait udev for software interfaces created externally.
12 jobs for bg/add-activate-fail-rh1667874 in 27 minutes and 13 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test
passed #307560
allowed to fail
checkpatch

00:01:26

passed #307567
t_debian:9

00:17:53

passed #307569
t_debian:sid

00:15:06

manual #307568
allowed to fail manual
t_debian:testing
passed #307561
t_fedora:28

00:27:09

passed #307562
t_fedora:29

00:26:55

passed #307563
t_fedora:30

00:24:49

manual #307564
allowed to fail manual
t_fedora:rawhide
passed #307565
t_ubuntu:16.04

00:17:29

passed #307566
t_ubuntu:18.04

00:18:06

 
  External
passed NetworkManager test verification

passed NetworkManager test verification

05:49:07