Let DnsManager fill in LinkProperties for private DNSes

(clean cherry-pick from ag/3880157)

Test: new tests pass
Bug: 73641539
Change-Id: I971ef4d27b22a435d7459e1c4b31a8715ef6e610
Merged-In: I837df61e3c277ae08ebf4fdcd4c4e9ac8c550811
Merged-In: I72ecaa4f7d7320ffa2e0ba82fadafc947c8a6981
2 files changed