Simplify `ndpi_internal_guess_undetected_protocol()` (#1941)

`ndpi_guess_undetected_protocol()/ndpi_internal_guess_undetected_protocol()`
is a strange function:
* it is exported by the library and it is actively used by `ntopng`
* it is intrinsecally ipv4-only
* it returns basically something like "classification_by_ip"/"classification_by_port"
(these information have already been calculated in `ndpi_do_guess()`...)
* it access the bittorrent LRU caches (similarly to
`ndpi_detection_giveup()` but without all the other caches...)

So:
* make the interface IPv4/6 agnostic
* use the classifications already available

This work will allow to make the Bittorrent caches IPV6-aware (see
81e1ea5).

Handle Dropbox classification "by-port" in the "standard" way.

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