vhostuser enabling

[egernst]

Changes for introducing vhost-user enabling to virtcontainers.

In future still need to add support for generic vhost-user-block devices and to test vhost-user SCSI end to end.

[egernst]

@mcastelino -- take a look?

[egernst]

@sboeuf -- agreed this is non-marginally sub-optimal method (the discovery of the socket in the network endpoint case). AFAICT it can't be made that generic, however, as this isn't just a socket being passed to qemu. In govmm we are taking this device type and appending a net device onto the command line, including setting/passing ip, route, Mac, etc. @mcastelino -- you have further thoughts here?

[egernst]

Good points, Sebastien. Let me make some updates.

[egernst]

@sboeuf @mcastelino -- update to address our comments.

[sboeuf]

@egernst Thanks, I'll take a look !

[sameo]

LGTM

[sboeuf]

Yes looks good to me too. I'd like to wait for @amshinde approval before we merge. @egernst the CI is not passing.

[amshinde]

lgtm

[egernst]

@sboeuf -- let me know if you have any more inputs on this patchset. Thanks.

[sboeuf]

@egernst nope, it's all good !