ssh: sssd_ssh fails completely on p11_child timeout
When p11_child fails or timeout is reached, ssh login fails.
With this patch sssd_ssh proceeds to ssh key and password login.
Resolves:
https://pagure.io/SSSD/sssd/issue/3937
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
Reviewed-by: Sumit Bose <sbose@redhat.com>