IPA Restore: allows to specify files that should be removed
Some files/directories should be removed before backup files are copied
to filesystem.
In case of DNSSEC, the /var/lib/ipa/dnssec/tokens directory has to be
removed, otherwise tokens that are backed up and existing tokens will be
mixed and SOFTHSM log in will not work
https://fedorahosted.org/freeipa/ticket/5293
Reviewed-By: David Kupka <dkupka@redhat.com>