openvswitch version with cloudstack

[Kuang-Ching Wang]

With ubuntu apt-get, openvswitch 1.4.6 is installed.  Is there any reason that 
cloudstack cannot work with 1.4.6, and have to work with 1.9.0 as documented 
here 
https://cwiki.apache.org/confluence/display/CLOUDSTACK/KVM+with+OpenVSwitch?

Thanks,
KC