Description of problem:
The current version of the installer has checks that may erroneously indicate that certain keystores are valid when they are not.

Version-Release number of selected component (if applicable):
6.0.2 ER3

How reproducible:
Always

Steps to Reproduce:
1. Create a keystore with type PKCS12.
2. Use this keystore as the Vault keystore.

Actual results:
Validation passes (it should not pass here), and installation fails.

Expected results:
Validation does not allow the installation to proceed (Vault only supports JCEKS and JKS keystore types by default)

Additional info:
This issue affects BPMS and BRMS installers identically.