team: don't kill teamd for external devices

The teamd instance must not be killed if the device was externally
activated.

https://bugzilla.redhat.com/show_bug.cgi?id=1693142
12 jobs for bg/team-assume-rh1693142 in 26 minutes and 44 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Test
passed #307520
allowed to fail
checkpatch

00:01:35

passed #307527
t_debian:9

00:17:26

passed #307529
t_debian:sid

00:16:33

manual #307528
allowed to fail manual
t_debian:testing
passed #307521
t_fedora:28

00:23:51

passed #307522
t_fedora:29

00:26:43

passed #307523
t_fedora:30

00:21:16

manual #307524
allowed to fail manual
t_fedora:rawhide
passed #307525
t_ubuntu:16.04

00:12:22

passed #307526
t_ubuntu:18.04

00:16:41

 
  External
passed NetworkManager test verification

passed NetworkManager test verification

05:47:29