Fix: IPv6 reverse DNS zone handling

[Marcel Ritter]

Hi,

while playing around with samba4 bind9_dlz and IPv6,
if ran into the following problem:

Using a Windows 7 MMC it is possible to add a reverse
IPv6 zone, however upon first refresh it gets sorted into the
forward zone list, which prevents a user from adding PTR
records :-(

Looking at the samba4 code, it looks like reverse zone handling
is only done for IPv4 zones (ending in "in-addr.arpa").

Handling of IPv6 zones (ending in "ip6.arpa") is missing.

The attached patch fixes that behavior .

IPv6 reverse zones work, PTR records can be added (only tested
from MMC, not yet with "samba-tool dns"), and nslookup/dig
return valid entries.


Bye,
    Marcel

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