shell: Fix auth-methods-results when syncing users
shell: Fix auth-methods-results when syncing users

We need a failing transport to detect if
password auth is supported when syncing users.
Use a invalid username to trigger it.

Closes #3229
Fixes #3220
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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