don't compute role from key name string when calling frontdoor

[wildemat]

Ticket(s): FE-6220

Problem

When creating a Just-in-time key, we get the role from the keyName which includes a delimiter between path and role. This delimiter can be used in the user's input database to break the command.

Solution

Don't rely on delimiter. Store the users input database as path, and keep it separate from the role.

Result

Path and role are kept separate when calling frontdoor

Testing

Updated credentials test