Re-enrollment of an ER should clear existing enrollments

[andrewpmartinez]

Experienced
Issuing multiple ER re-enrollments causes them to remain in the data store. Causing issues on which JWT is returning per ER as it will be data order dependent/sorting dependent.

Expected
Only 1 outstanding enrollment per Edge Router due to the fact that they do not support multiple authenticators.

Reproduction

1. Create an ER and enroll it
2. Trigger re-enrollment twice on the ER
3. Note that two enrollments existing the data store, only the most recent should remain

Notes:

The ER enrollment endpoint does not allow the expiration date to be set. Instead, it uses a configuration value from the controller's configuration file, which defaults to 180 minutes if not set.

Looking into that I found another bug, it uses the the identity duration instead of the router one by mistake.

The config values are edge.enrollment.edgeIdentity.duration and edge.enrollment.edgeRouter.duration, expected integers as minute values