Revert "intg: Invalidate memory cache before removing files"
It is not necessary to invalidate memory cache before removing
them. The sssd_client can handle it without any problem.
This reverts commit eabc1732ef91548616a699b7e9f8d30e5e7b8dd3.
Reviewed-by: Michal Židek <mzidek@redhat.com>