ipatests: Fix test_ipa_cert_fix.py::TestCertFixReplica teardown
    
    Fixture `expire_certs` moves date back after renewing the certs.
    This is causing the ipa-replica to fail. This fix first uninstalls
    the server then moves back the date.
    
    Fixes: https://pagure.io/freeipa/issue/9052
    
    Signed-off-by: Mohammad Rizwan <myusuf@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>