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Can you reproduce this bug with network.service disabled and NetworkManager enabled?
There is nothing to fix in systemd wrt. this bug. This needs to be workarounded in initscripts. On shutdown/reboot network service needs to detect that there is some nfs mount present on the system and in such case it must not ifdown network interfaces. Issue doesn't occur when NetworkManager is used because *by default* it leaves interfaces configured even daemon itself exits.
There was quite a lot of changes regarding network and ordering. Could you please check it with rhel-7.3 beta?