dracut: add `dracut_NM_NFS_root_nfs_ip[6]_manual_gateway_hostname` tests
Add tests covering most of the ip=... option.
Specify interface by MAC address, to cover: https://bugzilla.redhat.com/show_bug.cgi?id=1879795
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Add tests covering most of the ip=... option.
Specify interface by MAC address, to cover: https://bugzilla.redhat.com/show_bug.cgi?id=1879795