488d01c py3: create DNS zonefile: use textual mode

1 file Authored by mbasti 7 years ago, Committed by jcholast 7 years ago,
    py3: create DNS zonefile: use textual mode
    
    Also code was rewritten to use NamedTemporaryFile with context
    
    https://fedorahosted.org/freeipa/ticket/4985
    
    Reviewed-By: Jan Cholasta <jcholast@redhat.com>