go 1.12 was removed from oe-core, but currently k8s cannot
be built successfully with go 1.13. See link below.
https://github.com/kubernetes/kubernetes/issues/82531
We need to wait for k8s to support go 1.13 and update it
to latest release, as well as its depedencies. Before this
is done, add back go 1.12 and use it.
Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
