Neutron ML2 plugin fails when two mechanism drivers for different hypervisors( KVM and Hyperv) are configured in the ml2_conf.ini

I am trying out Icehouse on ubuntu 14.04. My controller has got two computes attached: one hyperv and other KVM. Hyperv runs hyperv_neutron agent as L2 and kvm runs OVS.

ML2 conf.ini gives you the option to provide both hyperv and openvswitch separated by comma as the mechanism driver, but it seems that one of them takes into effect at a time. i.e. when the configuration is like this: mechanism_drivers = hyperv, openvswitch only hyperv nova instances gets the port attached to the vnic and while kvm instances fail while when the configuration is like this: mechanism_drivers = openvswitch, hyperv, only KVM nova instances gets the port attached to the vnic and while hyperv instances doesn't get the network adapter configured.

Please help me resolve this issue.