f52a15b Overhaul bind upgrade process

Authored and Committed by cheimes 3 years ago
    Overhaul bind upgrade process
    
    /etc/named.conf is now owned by IPA. The file is overwritten on
    installation and all subsequent updates. All user modification will be
    lost. Config file creation and update use the same code paths.
    
    This simplifies upgrade process a lot. There is no errprone fiddling
    with config settings any more.
    
    During upgrade there is a one-time backup of named.conf to
    named.conf.ipa-backup. It allows users to salvage their customization
    and move them to one of two user config files which are included by
    named.conf.
    
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
    
        
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