IOT-1378 Fix windows\CAIPNWMonitor.c

IOT-1378 Fix windows\CAIPNWMonitor.c

* Allow IPv4 and IPv6 to coexist. Previously, these two
  modes were mutually exclusive.

Change-Id: I5c04289590b0edd58dc854722c0288a99b4c70c9
Signed-off-by: Daniel Ferguson <daniel.j.ferguson@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/12699
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Soemin Tjong <stjong@microsoft.com>
Reviewed-by: David Antler <david.a.antler@intel.com>
Reviewed-by: Dave Thaler <dthaler@microsoft.com>