Convert etcd recipe from golang to goarch bbclass
Convert etcd recipe from golang to goarch bbclass

The etcd recipe is failing to build for raspberrypi3 because TARGET_GOARCH
is not being set.

This converts the recipe from the custom golang.bbclass to use the new
go and goarch.bbclasses from oe-core.

Signed-off-by: Rob Woolley <a7d8b90bbdfdfa8ce7f587158d7158129e0bbc0e@windriver.com>

OverC/meta-overc,masselstine/meta-overc,OverC/meta-overc,OverC/meta-overc,OverC/meta-overc,OverC/meta-overc,masselstine/meta-overc,OverC/meta-overc,masselstine/meta-overc,masselstine/meta-overc