gddo: Re-vendor all dependencies

This re-vendors all dependencies for gddo-server, lintapp, and
talksapp. It also fixes the current problem with talksapp failing on
travis-ci.

Change-Id: I11e9a9d75a0116cde53812593a8b08067c94eb12
Reviewed-on: https://go-review.googlesource.com/33200
Reviewed-by: Tuo Shan <shantuo@google.com>