traceroute annotation bugfix, 10% tcpinfo snapshot, better insert logs

NOTE: The current production code is experiencing about 8k backend failures per hour, most likely tcpinfo quota exceeded.

The following PRs have been submitted since 2.2.3

better insert error log (#828) …
keep only 1/10 of snapshots (#832) …
Fix the missing last few tests for a tarball (#830) …

There was also #825, but it was reverted.
Update unit tests to use changed Geo field names (#825) …
Revert "Update unit tests to use changed Geo field names (#825)" (#826) …