Bug 1020343

Original issue: 
 BZ1018745 - Can enter empty username filter on LDAP security configuration screen, installation will fail.

Description of problem:
 Fix error message on LDAP security screen "A new LDAP security realm requires a Security Realm Name, an LDAP Username, and a Base Distinguished Name (Base DN). All three of these fields must be filled.". I think the best way it would be to use same message for all three fields saying:
"A new LDAP security realm requires a Security Realm Name, a Base Distinguished Name (Base DN), and a Username filter. All three of these fields must be filled."


Version-Release number of selected component (if applicable):
 EAP 6.2.0.ER6

How reproducible:
 always

Steps to Reproduce:
 1. Start gui installation, use default values until you reach Post-install configuration screen.
 2. Select to Perform additional post-install configuration, check to Enable LDAP authentication.
 3. Fill password fields on first LDAP Configuration screen, push Next button to enter LDAP security configuration screen.
 4. Enter "" into input field.

Actual results:
 "A new LDAP security realm requires a Security Realm Name, an LDAP Username, and a Base Distinguished Name (Base DN). All three of these fields must be filled." for empty Security Realm Name and Base DN. "Username filter must not be blank" for empty Username filter.

Expected results:
 "A new LDAP security realm requires a Security Realm Name, a Base Distinguished Name (Base DN), and a Username filter. All three of these fields must be filled." for all input fields.