DP: Add dp_sbus_invalidate_group_memcache() This function will be called from the data provider to the NSS responder, which will invalidate a group in the memcache. Related: https://pagure.io/SSSD/sssd/issue/2653 Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com> Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

DP: Add internal interface to invalidate memory cache from DP Adds an interfae to the Data Provider that allows the DP to notify the NSS responder to invalidate its memory cache records. Reviewed-by: Pavel Březina <pbrezina@redhat.com>

DP: Add internal interface to reset negative cache from DP Adds a an interface that allows the Data Provider to notify responders to drop their negative cache. Reviewed-by: Pavel Březina <pbrezina@redhat.com>

DP: Add internal DP interface to set domain state Adds functions to the interface Data Provider publishes towards back ends that allows the back ends to notify responders that a domain has been enabled or disabled. Reviewed-by: Pavel Březina <pbrezina@redhat.com>