refactor server_status_monitor.php
1. split long functions
2. add server_status_monitor.lib.php
Merge branch 'master' of https://github.com/phpmyadmin/phpmyadmin into 0609_monitor
rename the function to a meaningful name
Merge pull request #421 from xmujay/0609_monitor

refactor server_status_monitor.php 1. split long functions 2. add server_status_monitor.lib.php