NSS: Add InvalidateGroupById handler There are some situations where, from the backend, the NSS responder will have to be notified to invalidate a group. In order to achieve this in a clean way, let's add the InvalidateGroupById handler and make use of it later in this very same series. Related: https://pagure.io/SSSD/sssd/issue/2653 Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com> Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

NSS: Rename the interface to invalidate memory cache initgroup records for consistency Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

NSS: Add sbus interface to clear memory cache Adds three new NSS interface sbus methods to disable memory caches of users, groups and initgroups. It's enough to add this interface to the NSS responder because the NSS responder is the only writer to the memory cache. Reviewed-by: Pavel Březina <pbrezina@redhat.com>

DP: Remove old data provider interface Reverse data provider interface is moved to a better location in NSS responder. All responders now can have an sbus interface defined per data provider connection. The unused old data provider interface is removed. Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>