Description of problem:
The MySQL plugin (downloaded from https://www.jboss.org/community/wiki/jopr-releases) does not correcty add its database childs, altough the Server has the metrics collected, plotted and its availability computed. 

Version-Release number of selected component (if applicable):
JON 2.3.0
Jopr 2.3.1 (where I downloaded the plugin)
rhq-mysql-plugin-1.3.1

How reproducible:
See below. Same issue on two different JON servers (same release, same steps)

Steps to Reproduce:
1. Set up an MySQL on your machine. Assign an password for the root user.
2. Ensure that you have Abstract Database plugin on your JON Server
3. Add the rhq-mysql-plugin-1.3.1.jar to your plugin collection
4. On Platform, click on the computer platform and select its inventory
5. Scroll down the screen and on the "Manually Add", select MySql Server" (notice: it is not automatically detected by discovery routines) and click OK
6. Set up your database settings. Don't forget to change the MySql "Database Name" to mysql (case-sensitive). Set your root/password on the role name & password. Click OK.
7. Expand the MySql [mysql] server and you'll notice "Database (n)" as red
8. Expand the "Database (n)" category and click on any database. 

Actual results:
You'll notice that the availability tick on the right upper corner is set to an gray question mark and the "Database (n)" category is red colored.


Expected results:
The databases are supposed to be green colored and have its metrics correctly collected.

Additional info:
irc #jboss-on RodFreire