net-mgmt/check_mysql_health: update to 3.0.0.5

Submitter becomes maintainer.

Changelog:

* 3.0.0.5
  update GLPlugin, fix valdiff&lookback
* 3.0.0.4
  was a bad idea. now if there is no cache activity, there are no perfdata
* 3.0.0.3
  use the last good value for hitrates of there is absolutely no database activity
* 3.0.0.2
  default --lookback 3600 only if not given on the commandline
  fix version string
* 3.0.0.1
  default --lookback 3600
* 3.0
  new structure, using Monitoring::GLPlugin

PR:		274308