logical row counts inaccurate

logical row counts can get 'off' over time due to:

• messages that adjust the running counter being applied multiple times as a result of evictions

• non-key updates, which get converted to inserts but are not counted as inserts at injection time, adjust the running counter when existing keys are found during the application of the insert message.

See https://tokutek.atlassian.net/browse/DB-1006 and https://bugs.launchpad.net/percona-server/+bug/1607300