testing "go 1.5 for trusty"

[Nate Finch]

We need to make the go 1.5 jobs voting, and under the same restrictions we
put our 1.2 tests.  The reason they haven't been fixed is because they
haven't been voting, so we can ignore them.

Go 1.5 is not less reliable, go 1.2 just hides our mistakes better.
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