update Dockerfile.minimal to use alpine 3.4 (and go 1.6) #669
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The alpine-based minimal docker image has been broken since 0d7ae8e.
That commit removed Godep-based dependency management favor of go
1.5/1.6 vendoring. This commit moves the base alpine image forward to
3.4 which includes go 1.6.3. The resulting image of 0d7ae8e^ grows from
66 MB to 73 MB.