Implemented the use of the new QDnsLookup property "nameserver".
On the Linux platform, we can specify both IPv4 and IPv6 addresses
for the nameserver.
On Windows since we are using DnsQuery_W(), which does not have a
way of accepting IPv6 addresses, passing IPv6 nameserver address
is not supported.
On OSX/BSD platforms, specifying IPv6 addresses for nameserver
require access to the __res_state_ext structure which is in a
private header of libresolv (this header is different for BSDs and
OSX). If this feature has to be enabled in the future, we have to
figure out a way to access this struct by either accessing the
private header or by specifying one of our own. Currently, I'm
disabling it till such a solution is arrived at.
Nameserver support on different platforms:
Platform | IPv4 | IPv6
-------------+---------------+---------------
Linux/X11 | supported | supported
-------------+---------------+---------------
Windows | supported | not supported
-------------+---------------+---------------
OSX | supported | not supported
-------------+---------------+---------------
WinRT | not supported | not supported
-------------+---------------+---------------
Others | supported | not supported
| (not tested) |
-------------+---------------+---------------
Task-number: QTBUG-30166
Change-Id: Iedbddf15b9a62738ce4c2cfa0fce051514d64766
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
62f01d581b