[atomic-devel] go1.4 requirement

[Vincent Batts <vbatts redhat com>]

I see that upstream etcd is now requiring go1.4
https://github.com/coreos/etcd/issues/2524

Docker has churned on this for a while, but I have staved them off since
upgrading f20, f21 and epel6 to go1.4 would deprecate a few packages
(bash completion, emacs and vim editor files, etc) and this is not
something I care to push mid stream. 

The `net/http` BasicAuth is pretty small 
https://golang.org/src/net/http/request.go?s=16575:16641#L518
and seems like it _could_ be easily backported, though there are other
nice improvements to move forward to go1.4 for. And I'm not keen on
backporting things where an upgrade of version would be easier...

Thoughts?
vb

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