UDS - Changing pooling

So I was using *bytes.Buffer{} and taking the buff.Bytes() and using them, then stuffing the buffer back into a sync.Pool. I thought I was being clever. Allocations were way better than gRPC, so yeah!

Wrong. So I changed pooling in two ways:

• uses *[]byte
• custom Pool type

The new pool type has a static free-list before it uses sync.Pool.

This is breaking on UDS (minor) and as noted, uds can be changed without a major revision until I remove the warning on the README.