Closes #2797 (closed).
4ec6e63a add lease reuse statistics
v4 reuses leases both on fake allocation and on real allocation, while v6 only reuses leases on real allocation. This is a discrepancy that is also exposed in the statistics, and may seem confusing. However, this seems like the candidate for a new issue.
27cd6f9a add unit tests for lease reuse statistics
b9c9facb document lease reuse statistics
2ee4166e add ChangeLog entry