When writeDatagram is called without first binding the UDP socket,
then bind it as QHostAddress::Any.
This allows the same socket to be used to sent to both IPv4 and
IPv6 destination addresses.
Allowing the OS to autobind the socket inside sendTo() may
result in a single protocol socket.
Task-number: QTBUG-5275
Change-Id: I2b76507e8a8a38369c6eafb61ce4191d1d6cc930
Reviewed-by: Richard J. Moore <rich@kde.org>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Martin Petersson <Martin.Petersson@nokia.com>
cae5299f48