containers/docker: change docker images for golang 1.9

[sadysnaat]

I tried creating docker images and got the following error.

Running hooks in /etc/ca-certificates/update.d...
done.
Cloning into 'go-ethereum'...
build/env.sh go run build/ci.go install ./cmd/geth
ci.go:183: You have Go version go1.6.2
ci.go:184: go-ethereum requires at least Go version 1.7 and cannot
ci.go:185: be compiled with an earlier version. Please upgrade your Go installation.
exit status 1
Makefile:15: recipe for target 'geth' failed
make: *** [geth] Error 1
The command '/bin/sh -c apt-get update && apt-get upgrade -q -y &&   apt-get install -y --no-install-recommends golang git make gcc libc-dev ca-certificates &&   git clone --depth 1 --branch release/1.7 https://github.com/ethereum/go-ethereum &&   (cd go-ethereum && make geth) &&   cp go-ethereum/build/bin/geth /geth &&   apt-get remove -y golang git make gcc libc-dev && apt autoremove -y && apt-get clean &&   rm -rf /go-ethereum' returned a non-zero code: 2

So I have made necessary changes to Dockerfiles.

Please review.