[Tracker] Get Linux plugin fixes merged so artifact comparison testing can start

[atcuno]

This is the Linux side of #1574.

Tickets:

• Broken ns_dname handling causes backtrace #1594 (Gus respond to Andrew's fix)

PRs:

• Add mnt_parent check to kernel version validation #1590 (ikelos)
• Fix broken socket retrieval that causes backtrace #1591 (ikelos)
• Prevent backtraces when kthread full name is smeared #1592 (ikelos)
• Add missing pointer validation check in mountinfo #1593 (ikelos)
• Add smear checks and missing absolute flag to walk_internal_list #1595 (ikelos)
• Fix get_name API, fix malfind #1596 (atcuno)