app-emulation/lxd: Bump to v2.17

app-emulation/lxd: Bump to v2.17

Other than copying, 2 changes were made:

1. `EGO_VENDOR` update
2. Removal of `golang-build_src_install`

The second change was necessary because the "client.go" file at the root of
the project was removed. Also, I was already planning on removing it, after
having consulted with WilliamH on IRC, because this step installed many, many
useless files in /usr/lib/go-gentoo (pkg and src files, which are only needed
when a package is used as a library by another go package, and it isn't LXD's
case).

Package-Manager: Portage-2.3.6, Repoman-2.3.1