Add prompt when --keystore-password is missing for Vault command.

Use case:

• User have automation script using cs tool and user don't want to have password stored in file.
• User don't want credential store password to be stored in shell history after execution.
• User don't want credential store password to be listed in ps -aux output.

There have to be possibility to omit --keystore-password attribute. When omitting --keystore-password attribute user interaction prompt should follow with possibility to input password.