Drop DnsDomainFormatter.format_djb()
Drop DnsDomainFormatter.format_djb()

It does not work, we're using the dump_dns command for a long time now.

Change-Id: I3b469279d10c2e7cc2e646b8c99aabfaefd99976
Reviewed-by: Priya Joshi <3c6cfa6f57440adfc837c4ad04483313acbc2582@morganstanley.com>

guillaume-philippon/aquilon,guillaume-philippon/aquilon,guillaume-philippon/aquilon,quattor/aquilon,quattor/aquilon,quattor/aquilon