a572e61 server install: require IPv6 stack to be enabled

Authored and Committed by tkrizek 7 years ago
    server install: require IPv6 stack to be enabled
    
    Add checks to install and replica install to verify IPv6 stack
    is enabled. IPv6 is required by some IPA parts (AD, conncheck, ...).
    
    https://pagure.io/freeipa/issue/6608
    
    Reviewed-By: Martin Basti <mbasti@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
    
        
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