- Trying to create another admin user using the first boot wizard will certainly
fail.
- Show the list of admin users in the system so that they an be deleted and
creation of admin by first boot wizard can continue.
- If existing account can already work (such as when Plinth and LDAP entries
exist) allow skipping the step.
- Since the scenario is mostly like encountered only during advanced usage and
not for most regular users, the technical nature of solutions is okay.
Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>