[Bug 1022983] Consider updating Rawhide to Go 1.2 release candidate

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1022983

--- Comment #2 from Matthew Miller  ---
(In reply to Peter Lemenkov from comment #1)
> Love the idea! Actually I'd rather update golang in F20 as well not just in
> F21/Rawhide.

I think that's a little risky with the F20 schedule, where our release is
scheduled for just 2 days after theirs (and our bits will have to all be in
place the week before, for mirroring). So, we'd be shipping a RC with F20.
We've done such things before, but in my opinion it'd best to do a post-release
update.

But if the RC does seem to be stable and works with the packages we're shipping
(currently to my knowledge, just etcd and docker real-soon-now), maybe it's
worth the risk.