sudo integration test: Remove the local user test

SSSD does not support sudo rules for local users;
these should be added in a local sudoers file.

https://fedorahosted.org/freeipa/ticket/4608

Reviewed-By: Martin Kosek <mkosek@redhat.com>
Add Gabe Alford and Thierry Bordaz to .mailmap
Add additional backup & restore tests

https://fedorahosted.org/freeipa/ticket/3893
[TMP] CA-less integrtion test: Fix error messages
[DEBUG] Sleep to diagnose DNS issue