a007a15 DNSSEC: backup and restore opendnssec zone list file

Authored and Committed by mbasti 8 years ago
    DNSSEC: backup and restore opendnssec zone list file
    
    When zone list is not restored after unninstall, this may slow down
    enbaling DNSSEC signing for zones and print unwanted
    errors into log after new installation.
    
    Related to: https://fedorahosted.org/freeipa/ticket/5273
    
    Reviewed-By: Petr Spacek <pspacek@redhat.com>