daemon: Add some more debugging of the daemon startup

Reviewed-by: Marius Vollmer <marius.vollmer@redhat.com>
Closes #1456
daemon: Don't hang if AccountsService cannot be reached

And also don't export the accounts object when AccountsService
is not available.

Closes #1457
Reviewed-by: Marius Vollmer <marius.vollmer@redhat.com>