ifcfg-rh: preserve existence of wired setting

Currently the plugin doesn't preserve the existence of a wired setting
because the writer saves only variables with non-default values and,
especially, the reader always creates the setting.

Fix this; now the writer writes HWADDR even if empty when the setting
is present; the reader creates the setting when at least one property
is found.
12 jobs for bg/device-reapply-fail-rh1703960 in 42 minutes and 21 seconds (queued for 7 seconds)
latest
Status Job ID Name Coverage
  Test
passed #318752
allowed to fail
checkpatch

00:01:11

passed #318763
t_debian:9

00:15:45

passed #318765
t_debian:sid

00:16:52

manual #318764
allowed to fail manual
t_debian:testing
passed #318753
t_fedora:28

00:25:10

passed #318755
t_fedora:29

00:34:19

passed #318757
t_fedora:30

00:35:41

manual #318758
allowed to fail manual
t_fedora:rawhide
passed #318760
t_ubuntu:16.04

00:19:22

passed #318762
t_ubuntu:18.04

00:18:43

 
  External
passed NetworkManager test verification

passed NetworkManager test verification