Persistent connections: maxadmin reports 0 all the time even if connections are created

Test:
1. create 40 connections to RW split router for Galera cluster
2. close connections
3. Check 'show servers' output

Result:

Server 0x3a45630 (gserver1)
Server: 10.105.147.3
Status: Master, Synced, Running
Protocol: MySQLBackend
Port: 3306
Server Version: 5.5.45-MariaDB-wsrep-log
Node Id: 0
Master Id: -1
Repl Depth: 0
Number of connections: 40
Current no. of conns: 40
Current no. of operations: 0
Persistent pool size: 0
Persistent measured pool size: 0
Persistent max size achieved: 0
Persistent pool size limit: 10
Persistent max time (secs): 3660