[CA-57451] Use default "ip" for iovirt plugin
[CA-57451] Use default "ip" for iovirt plugin

Current trunk builds have a sufficiently up to date version of the
iproute2 package for SR-IOV VF configuration.

Signed-off-by: James Bulpin <72bfdc294e729e409f81e31a033889e50e9493d5@citrix.com>

djs55/xcp-rrdd,koushikcgit/xcp-networkd,djs55/squeezed,sharady/xcp-networkd,robhoes/squeezed,johnelse/xcp-rrdd,koushikcgit/xcp-networkd,djs55/xcp-rrdd,simonjbeaumont/xcp-rrdd,djs55/xcp-networkd,simonjbeaumont/xcp-rrdd,johnelse/xcp-rrdd,djs55/xcp-networkd,sharady/xcp-networkd,koushikcgit/xcp-rrdd,koushikcgit/xcp-rrdd,koushikcgit/xcp-rrdd