[PKT-3] Add IP summarization exclusion based on ASN

[Richard Boucher]

The IP summarization configuration parameter of the Flow handler currently supports exclusions based on a list of subnets. It would be useful in certain settings to be able to define this exclusion based on the ASN number as well. Something like:

summarize_ips_by_asn: true
exclude_asns_from_summarization:
    - 62597

_PKT-3

[Leonardo Parente]

@rboucher-me