Use API instead of vppctl to interact with VPP

[fepan]

Instead of using vppctl, we should use either python or go API to configure VPP.

[rkamudhan]

Hi Feng,

Interesting, We did this as inital PoC. Welcome your PR on this.

[rkamudhan]

Plus all features are tested with VPP 17.01, Welcome the PR for the latest VPP

[rkamudhan]

@fepan Updated README.md for more understanding.

[fepan]

Excellent, the documentation helps a lot. One thing I'm wondering, do we need to maintain support for VPP 17.01 as well as latest version, or is it OK to just add support for latest version. With latest VPP version, there could be some API changes as well as vhostuser/virtio-user incompatibility, so I'm wondering if we should use 17.01 as a reference.

[rkamudhan]

@fepan I am highly inclined to go for the latest version and also for the API changes.

[fepan]

@rkamudhan sounds good, I'll test with latest.