Revert "Change import path from code.google.com/p/go.net/context to golang.org/x/net/context."
Revert "Change import path from code.google.com/p/go.net/context to golang.org/x/net/context."

This reverts commit 718390f8d6d12c45a7671f4b6dd43b7060e31ce2.

gonzojive/mdns