Handle LUKS passphrase before doing sanity check (#1060255)
    
    Resolves: rhbz#1060255
    
    The sanity check checks that a LUKS passphrase has been set, so we want to give
    the user the opportunity to set that passphrase if the occasion calls for it.
    
    We only prompt them for the passphrase the first time they click Done, not the
    second time.
    
    Signed-off-by: mulhern <amulhern@redhat.com>