follow dh-golang's expectations a little more
follow dh-golang's expectations a little more

dh-golang sets up the GOPATH in the configure stage, not the build stage, so
it feels cleaner to do the fixing up lxd's packaging needs to do immediately
after that. This requires a fix to remove github.com/lxc/lxd/dist, because
dh-golang's build stage runs go install github.com/lxc/lxd/... and that gets
very confused when all the bundled deps are still there!

All this makes building lxd against shared libraries easier.

Signed-off-by: Michael Hudson-Doyle <5e87ffb38a52af6fb9a19b679e9122c7a4d601a5@canonical.com>

lxc/lxd-pkg-ubuntu,lxc/lxd-pkg-ubuntu,lxc/lxd-pkg-ubuntu