failover: proceed normally when no new server is found
Multiple failover requests come in same time, the first one will
result in collapsing the meta server but multiple resolution of
SRV records are triggered. The first one finishes normally but the
others won't find any new server thus ends with an error.
This patch makes failover to proceed normally even in such case.
Resolves:
https://fedorahosted.org/sssd/ticket/3131
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
Reviewed-by: Fabiano Fidêncio <fidencio@redhat.com>
(cherry picked from commit 03cb5ac6aa4c60d2c64c6fdc2daae656bf5493f4)