dracut: add test for ip={ifname}:off feature
ip={ifname}:off should set ipv{4,6}.method to disabled.
https://bugzilla.redhat.com/show_bug.cgi?id=1883958
@os:rhel8.4 @RunTests:dracut_setup,dracut_NM_NFS_root_nfs_ip_off
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ip={ifname}:off should set ipv{4,6}.method to disabled.
https://bugzilla.redhat.com/show_bug.cgi?id=1883958
@os:rhel8.4 @RunTests:dracut_setup,dracut_NM_NFS_root_nfs_ip_off