tap-device, multi-queue: enforce single-queue tap
tap-device, multi-queue: enforce single-queue tap

When netlink creates the tap device, and a single queue is
requested, it mistakingly uses the multi-queue flags: [0].

Until [1] is fixed, we need to explicitly indicate we're using the
single-queue flags.

[0] - https://github.com/vishvananda/netlink/blob/02121dbd7ee10473243d10348b59100da63a46c7/link_linux.go#L1125
[1] - https://github.com/vishvananda/netlink/issues/574

Signed-off-by: Miguel Duarte Barroso <c798d3f0e4fda7badfc3bbd91babde7ebd48b6c2@redhat.com>

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