incremental sync stops

[mdraheim]

Likely related to #52 . Setup is the same.

Problem:

Incremental sync just stops at some point. Immediately after full sync, the incremental syncs trigger and show up in crowd audit log. After some time, this just stops. Which, in turn, auto-triggers a full sync on app restart which we would like to avoid because of #52 .

My uneducated guess is that incremental sync suffers from newly added audit log entries during sync. Somewhat similar to full sync. But where full sync is trying too hard, incremental sync might not be trying hard enough.