Update OpenINTEL crawler

[m-appel]

Better handling for CNAMEs. Previously we treated them as chains, but they are more like trees.

Description

Instead of assuming straight chains we now do a depth-first traversal to find all valid RESOLVES_TO relationships.

Motivation and Context

The initial version of this assumed that each query can only have a straight CNAME chain to one or more A/AAAA records. However, there are cases where the chain branches, i.e., one name has multiple CNAME records, or even a name having both a CNAME and an A/AAAA record.

How Has This Been Tested?

Full run of all instances of OpenIntelCrawler

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.