Add retry mechanism to get_ipv4_addr - #1621
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Some resource-constrained devices intermittently do not answer a given ARP request, so a single nmap sweep can miss a device that is in fact present. This feature retries the sweep a few times (each retry issues fresh ARP requests) before giving up, so one dropped reply does not cause resolution to fail, which is what happens as of 2.3.4 (untested on 2.4.0).