IPA_PROVIDER: Explicit no handle of services
Function get_object_from_cache() does not handle services.
This patch adds quick shortcut to avoid sending an LDAP query
to cache.
Resolves:
https://fedorahosted.org/sssd/ticket/2747
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
(cherry picked from commit 565e6d91814884054ec0dc4d770804d7bf472d3f)