Need to "fuzz" interval_end for arp_table_query in NimiDbAdapter
The NIMI arp_table_intervals table has records with interval_ends that are always in the past.
When looking up an IP address for the current time (ie. now()), the record will not be found
unless the current time is "fuzzed" (or retarded into the past). The proposed fuzz is 1 day.