anonymizer_tool: IPv6 sanitization improvements.

This patch whitelists certain special purpose IPv6 subnets and prevents
spurious matches from being treated as scrubbable IPv6 addresses,
as per go/cros_ip_logsanitizer.

BUG=b:111048642
TEST=components_unittests

BUG: 908117
Change-Id: If8ee24aba1ca5ac9a077dcb1cfa88ac9a69807f5
Reviewed-on: https://chromium-review.googlesource.com/c/1424626
Commit-Queue: Garrick Evans <[email protected]>
Reviewed-by: Dominic Battré <[email protected]>
Reviewed-by: Thiemo Nagel <[email protected]>
Auto-Submit: Garrick Evans <[email protected]>
Cr-Commit-Position: refs/heads/master@{#626507}
2 files changed