nrtm acl does not seem to use host addresses

[troy2914]

Tested with 4.0.1

/32 in the nrtm list (ex:
generic_nrtm_access:
- 'ipv4/32'

also tried with "- 'ipv4'" and "- '::ffff:ipv4/128" and "- '::ffff:ipv4'

where the sources: per source has a
nrtm_access_list: generic_nrtm_access

2019-06-26 18:44:03,655 irrd[101570]: [irrd.server.access_check#INFO] Rejecting request, IP not in access list generic_nrtm_access: ::ffff:ipv4
and "encountered parsing error while parsing query "-g NTTCOM:1:1034619-LAST": Access denied"

changing to /0 allowed the nrtm queries through.