[WIP] initramfs-init: Always configure network when ip= is given

Closed Carlo Landmeter requested to merge github/fork/nero/ip-always into master

Created by: nero

Previously, only alpine_repo= and apkovl= triggered the configuration of the network. Not using them caused the ip= parameter to be ignored.

The invocations of configure_ip for said two options were not removed because network configuration may still be triggered by the options named above. The function itself is safe to be invoked multiple times.

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