Cannot install custom password vault outside EAP directory

Description of problem:
If you want to create custom password vault outside jboss-eap-6.1 directory the installation process will fail. This prevents users from creating custom password vault when installing both BRMS and EAP at once as the EAP folder does not exist at the moment when you select keystore location. Also the default keystore location in BRMS installer is outside that directory.

Version-Release number of selected component (if applicable):
6.0.2 ER1

Steps to Reproduce:
1. Run the installer and proceed to the page with title 'Configure runtime environment'.
2. Select 'Perform advanced configuration' and check 'Install password vault'.
3. On the next screen fill in password fields, leave default values in the other fields.
4. Try to finish the installation.

Actual results:
The installation process will fail in the last step when EAP is run.

Expected results:
The installation process should finish successfully.

Additional info:
This issue only affects BRMS installer. BPMS installer allows users to create password vault wherever they want (only limited by bug 1090036).