QtNetwork: bypass proxy for local connections

QtNetwork: bypass proxy for local connections

According to Qt doc, "Network proxy is not used if the address used in
connectToHost(), bind() or listen() is equivalent to
QHostAddress::LocalHost or QHostAddress::LocalHostIPv6. This is not the
case in current implementation.

Change-Id: I6b8a40c1e8bd8aad9504d8f939b87eda6e93337c
Reviewed-by: Richard J. Moore <rich@kde.org>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Shane Kearns <shane.kearns@accenture.com>