Adjust the log mechanism for DoH and some minor changes.

1. Init the log level by device build.
2. Add TODO comment for aosp/1769446.
3. Higher the log level for sensitive log msgs.
4. Sort the input servers before processing it with DoH.

Test: atest
Bug: 193850030
Bug: 155855709
Change-Id: I67932699275354e7ebdb1636d7c8bf977d43cfbd