[SSSD] [PATCH] sss_cache: Better error reporting

[Jakub Hrozek]

https://fedorahosted.org/sssd/ticket/1301
https://fedorahosted.org/sssd/ticket/1305
https://fedorahosted.org/sssd/ticket/1306

Whether to return non-zero if any operation fail or all of them (which
is the current behaviour) is debatable.