Support custom password auth properties file

[yardenc2003]

As for now, one you've set your auth type to "PASSWORD" via Values.server.config.authenticationType, you are forced to use a specific conf file set for password file auth.

This implementation restricts auth configurations in the following ways:

1. It restricts the usage of configurations specific to that auth implementation (e.g., we cannot configure file.auth-token-cache.max-size).
2. Even worse, it does not allow configuring LDAP properties, which should also be enabled by the "PASSWORD" auth type.

This PR suggests a small fix to address these scenarios.

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[yardenc2003]

@cla-bot check

[cla-bot]

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