cnitool: support capablity args
cnitool: support capablity args

Signed-off-by: Pengfei Ni <5ba478f7e379e5026033ada2badb07ae28fac367@gmail.com>

containernetworking/plugins,kad/cni,containernetworking/cni,appc/cni,appc/cni,dcbw/cni,squeed/plugins,containernetworking/plugins,mcastelino/cni,mcastelino/cni,containernetworking/cni,dcbw/cni,squeed/plugins,rosenhouse/cni,kad/cni,rosenhouse/cni