Currently there isn't much handling of exceptions which may be thrown from User
Storage SPI methods.
- when `UserStorageProvider.preRemove` throws an exception it's not possible to remove
a group/role or realm in which the offending provider is registered
- when `UserLookupProvider.getUserByUsername` throws an exception this blocks all lower
priority providers from looking up users
- exception from `UserStorageProviderFactory.create` blocks all providers from lookup,
credential validation/updates, etc.
I can't decide whether this "fail fast" behavior is bug or feature. On one
hand it lets the developer know there's a problem with the provider. On the other hand
it destabilizes the other providers in the realm.
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