Description of problem:
 add-user utility is returning wrong error message for password without alphabetic character. Also password requirements noted in documentation are wrong:
- It can not be the same as the user name.
- It must contain at least 8 characters.
- *It must contain at least one alphanumeric character.*
- It must contain at least one digit.
- It must contain at least one non-alphanumeric symbol

Version-Release number of selected component (if applicable):
 EAP 6.2.0

How reproducible:
 Always

Steps to Reproduce:
 1. Navigate to $EAP_HOME/bin folder
 2. run: add-user.[sh|bat] admin 22222222

Actual results:
 * Error * 
JBAS015268: Password must have at least one alphanumeric character.

Expected results:
JBASxxxxxx: Password must have at least one alphabetic character.

Additional info:
 We have to fix also documentation [1] (see password description) and installer (which is now accepting password without any alphabetic character)

[1] - http://documentation-devel.engineering.redhat.com/site/documentation/en-US/JBoss_Enterprise_Application_Platform/6.3/html-single/Administration_and_Configuration_Guide/index.html#Add-user_Command_Arguments