I come from the OpenBazaar project and I am new to go-libp2p and go-ipfs. Are the examples that use libp2p in a production environment? Where's the best place to learn libp2p by example?

Dhcpv4Client ignores the device checksum capabiltities, and always uses the default value for ChecksumCapabilities. The code responsible can be seen here:
https://github.com/smoltcp-rs/smoltcp/blob/bdfa44270e9c59b3095b555cdf14601f7dc27794/src/dhcp/clientv4.rs#L133

As far as I can tell, this would basically be a one-line fix:

let checksum_caps = iface.device().capabilities().check

This is an optimization to reduce the time it takes to build/deploy YAStack.

Compilation of YAStack can be optimized by pre-compiling source code that does not depend on DPDK. This can help build the image faster since now only DPDK and dependent code will have to be compiled.