This commit adds the windows installer to the OVS tree.

This commit adds the windows installer to the OVS tree.

Requirements are the following:
Visual Studio Community 2013
WiX Toolset 3.9
Microsoft_VC120_CRT_x86.msm

More detailed information on the requirements and build instructions
can be found under:
https://github.com/cloudbase/ovs-windows-installer/blob/master/README.rst

To run and make the installer issue the following:

./boot.sh
./configure CC=./build-aux/cccl LD="`which link`" \
LIBS="-lws2_32 -liphlpapi" --prefix="C:/openvswitch/usr" \
--localstatedir="C:/openvswitch/var" --sysconfdir="C:/openvswitch/etc" \
--with-pthread="C:/pthread" --with-vstudiotarget="Release"

make clean && make -j16 windows_installer

To uninstall one could use the following Powershell commandlets:
$app = Get-WmiObject -Class Win32_Product | Where-Object `
 { $_.Name -match "Open Vswitch" }

$app.Uninstall()

Signed-off-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Co-authored-by: Alessandro Pilotti <apilotti@cloudbasesolutions.com>
Signed-off-by: Alessandro Pilotti <apilotti@cloudbasesolutions.com>
Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>