The Connection Pool Status feature in webtools is broken

This was introduced by OFBIZ-4864 hence 1st in R13.07 where it still work well (see demo), as the connection pooling. But has been broken since, with the pooling.
Fortunately, it's easy to fix and has no implications has long has you don't enable verbose logging (the DebugManagedDataSource only extends ManagedDataSource for verbose logging and to generate the info needed for the Connection Pool Status feature).