Even for a valid domain that usually resolves, sometimes the local DNS
resolver won't be able to resolve it (duh). Catch the exception that gets
thrown in that instance and fail gracefully by returning an empty list.

that are not away from some other X secs.

from some other X secs.
In #27338 it was implemented to do not include relays in the
bandwidth files that does not have at least 2 measurements that
are X secs away from each other.
It was implemented removing any results that were not X secs away
from each other, when all the results should be keep when there is
at least one away from the others, as commented in #28061.

When there's at least one result that is X secs away from any other,
all the results should be keep.

when the arg is provided.
Also, use list when filtering the results and add debugging lines

to 3.5, we stop supporting 3.4

and results away

and do not include them as data files in python packages,
since system packages will then include them in /usr

has been removed. Also add logging

and do not use classmethod for it, since it is only a comparison

since it is not needed anymore with new stem version

since stem 1.7.0 is released and there is no need for it anymore

which includes the required Timeout changes and eliminates the
need for the deprecated dependency_links

while process-dependency-links is needed