INSTALL.DPDK: Notes on running ovs-vswitchd/dpdk inside a VM

INSTALL.DPDK: Notes on running ovs-vswitchd/dpdk inside a VM

Additional configuration is required if you want to run ovs-vswitchd
with DPDK backend inside a QEMU virtual machine. This happens because,
by default, virtio NIC provided to the guest doesn't support multiple
TX queues which are required by ovs-vswitchd/dpdk. This commit updates
INSTALL.DPDK.md to provide guidelines on how to enable support for
multiple TX queues using QEMU command line and Libvirt config file.

Signed-off-by: Oleg Strikov <oleg.strikov@canonical.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>