fixed third time bash 3.x errors in 31_network_devices.sh #767
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fixed third time all remaining bash 3.x errors in 31_network_devices.sh
see #758 plus heavy syntax cleanup that I needed to understand that code at least to the extent that (hopefully) enables me to fix the bash 3.x errors correctly - i.e. without breaking the functionality of the code.
I would very much appreciate it if someone with proper networking knowledge can verify if the functionality of the code is still o.k.